Waking Up at Night Might Not Be Insomnia — It Might Be Biology

One of the most common concerns people bring to sleep therapy is not difficulty falling asleep. It is waking in the middle of the night and being unable to get back to sleep. The experience is almost universally accompanied by a specific kind of dread: something is wrong with me. I am broken. This is going to ruin tomorrow.

That dread, it turns out, may be a more modern invention than the waking itself.

For most of recorded human history — from ancient Greece through the Middle Ages and into the early modern period — people did not sleep in a single consolidated block. They slept in two distinct phases, separated by an hour or two of wakefulness. This was not considered a disorder. It was simply how the night worked.

The History: First Sleep, Second Sleep

Historian A. Roger Ekirch of Virginia Tech spent years researching the history of nighttime before stumbling onto something he had not expected. Buried in court documents, diaries, letters, medical texts, and literary sources spanning from the early Middle Ages to the Industrial Revolution, he found more than 500 references to a segmented sleep pattern — what people of the time called "first sleep" and "second sleep."

The pattern was consistent across sources. People went to bed not long after dark, typically between eight and ten in the evening. They slept for three to five hours. Then they woke. For an hour or two, sometimes longer, they would lie quietly, pray, talk with a bed partner, tend to household tasks by candlelight, or simply rest in a state of calm wakefulness that contemporaries described as peaceful rather than distressing. Then they returned to sleep — their second sleep — until dawn.

The interval between the two sleeps was not something to be endured. Historical records are filled with references to this practice — Chaucer mentioned it in the Canterbury Tales, and it appears across cultures and centuries as an unremarkable feature of normal life.

What Ekirch concluded was striking: the assumption that human beings are supposed to sleep in one uninterrupted block is not a biological given. It is a historical artifact — a pattern that emerged, and rapidly displaced all others, only after the Industrial Revolution and the widespread adoption of artificial lighting in the late nineteenth century.

The Science: What Happens When You Remove Artificial Light

Ekirch's historical findings might have remained a curiosity were it not for the work of psychiatrist Thomas Wehr at the National Institute of Mental Health. In 1992, Wehr published findings from an experiment in which he divided the experimental day into ten hours of daylight and fourteen hours of darkness, simulating preindustrial winter conditions.

After a period of adaptation, all participants began sleeping like people did in the past — four hours of sleep, followed by a short wakeful break, and then another four hours of rest. The break between the first and second sleep was experienced as relaxation rather than fatigue. During the interval, prolactin levels were elevated — a hormonal profile associated with deep rest even while awake. Wehr's conclusion was careful but significant: the biphasic pattern appeared to emerge naturally when people were removed from the influence of artificial light and allowed to follow their biology without external scheduling pressure. This was not a sleep disorder. It was, in his assessment, a default mode that modern life had overwritten.

What This Means for People Who Wake at Night

It is estimated that nearly one in three American adults regularly wakes in the middle of the night. For most of them, this experience is accompanied by anxiety — the worry that the waking is pathological, that the lost sleep will accumulate into impairment, that something is fundamentally wrong.

That anxiety is clinically significant in its own right. One of the most well-documented maintenance mechanisms of insomnia is not the waking itself but the response to waking: the alarm, the clock-checking, the mental calculation of hours remaining, the escalating distress that activates the sympathetic nervous system and makes returning to sleep considerably harder. Worry about sleep disrupts sleep. Disrupted sleep generates more worry. The cycle tightens.

Ekirch has argued that knowledge of biphasic sleep history can help people with insomnia by "easing their anxiety" about middle-of-the-night waking — that reframing the experience from pathological to biological can interrupt the catastrophizing that drives the cycle.

This does not mean nocturnal waking is always benign or never warrants clinical attention. Waking driven by sleep apnea, pain, or mood disorder is different from waking that reflects a biological rhythm. But for people whose primary distress is the anxiety about waking — the conviction that something is wrong and the consequences will be severe — the history of biphasic sleep offers something genuinely therapeutic: the possibility that what they are experiencing is not a malfunction but a memory.

The Dream Life We Lost

One of the more intriguing aspects of Wehr's experiment was that participants consistently woke from REM sleep during the interval — the stage most associated with dreaming. Ekirch notes that the historical evidence bears this out: waking directly after dreaming "afforded people a pathway to their subconscious." "With morning dreams we don't have the opportunity to let our dreams settle," he observed. "The light goes on and we get out of bed immediately."

The biphasic sleep pattern, with its built-in interval of quiet wakefulness after a period of dreaming, created a natural moment for that material to be held, noticed, and integrated before the demands of the day arrived. Modern consolidated sleep, with its abrupt transition from sleep to alarm to daylight, forecloses that space almost entirely.

The Clinical Takeaway

None of this is a prescription to restructure your sleep into two deliberate phases. The evidence does not support abandoning consolidated sleep for most people, and the practical demands of modern life make genuine biphasic sleep difficult to implement. As Ekirch himself acknowledged: "There's no going back because conditions have changed."

What the history and biology of biphasic sleep offers, clinically, is a reframe. And reframes, in sleep therapy, are not merely cognitive exercises. They can directly alter the physiological response that maintains insomnia.

If you wake at three in the morning and immediately experience fear — if you lie there calculating lost sleep, catastrophizing about the day ahead, fighting the waking as though it were an attack — you are activating a stress response that makes returning to sleep harder and that, over time, conditions your nervous system to associate the bed with threat. That is the cycle CBT-I is designed to interrupt. Part of what CBT-I works with is precisely the belief that sleep must be continuous, that waking is pathological, that anything less than unbroken consolidation is failure.

Before electricity, before industrial work schedules, people lay awake in the middle of the night and considered it unremarkable. They prayed. They talked. They thought. Then they went back to sleep.

That possibility is still available. What has to change, for many people, is not the sleep itself. It is the story they tell about waking up.

APA Citations:

Ekirch, A. R. (2005). At day's close: Night in times past. W. W. Norton & Company.

Ekirch, A. R. (2015). The modernization of western sleep: Or, does insomnia have a history? Past and Present, 226(1), 149–192. https://doi.org/10.1093/pastj/gtu040

Wehr, T. A. (1992). In short photoperiods, human sleep is biphasic. Journal of Sleep Research, 1(2), 103–107. https://doi.org/10.1111/j.1365-2869.1992.tb00019.

Why Everything Feels Worse at 3am: The Science Behind Your Midnight Mind

It is 3am. You are awake. And somehow, in the span of ten minutes, a small thing — an unreturned email, a stumbled sentence in a meeting, a vague tension with someone you care about — has become evidence that your career is collapsing, your relationships are failing, and the future is bleaker than you can bear to consider.

Then morning comes. Coffee is made. And the same situation that felt unsurvivable a few hours ago is, at most, a minor inconvenience. Nothing changed. The facts are identical. And yet the two versions of the story could not feel more different.

This is not anxiety in the ordinary sense. It is something more specific — a documented shift in how the brain processes information at night — and understanding it can genuinely change your relationship with those dark, 3am hours.

The Brain Runs a Different Program After Midnight

Sleep scientists and circadian neuroscientists have a name for what happens to our cognition in the nighttime hours: the "mind after midnight." It is not simply that we are tired and therefore grumpy. The brain undergoes measurable neurological changes after midnight that systematically alter the quality and character of our thinking.

The key mechanism involves the prefrontal cortex — the part of the brain responsible for rational evaluation, perspective-taking, cognitive flexibility, and emotional regulation. When we are fatigued, prefrontal activity diminishes. The top-down regulation that allows us to contextualize a problem, generate alternative interpretations, and maintain a sense of proportion becomes sluggish and unreliable.

With that rational oversight offline, the brain's limbic system — its threat-detection and emotional processing circuitry — gains disproportionate influence. Problems are perceived as larger and more intractable than they are. Ambiguous situations are interpreted through a lens of danger. The brain, built for survival first and accuracy second, defaults to worst-case scenarios.

Circadian rhythms compound this effect. Positive mood and emotional resilience peak during the day and reach their lowest point in the early morning hours, while sensitivity to negative emotional stimuli rises at night. What this means practically is that the same piece of information — a difficult conversation, a mistake at work, an unanswered message — will register as more threatening, more significant, and more personal at 2am than it would at 2pm.

Research published in Frontiers in Network Physiology by Tubbs and colleagues described this phenomenon formally, noting that nighttime wakefulness is associated with behavioral dysregulation and thought patterns that overlap significantly with the cognitive features of depression and anxiety: rumination, threat amplification, loss of proportionality, and emotional reasoning untethered from evidence.

The Rumination Window: Why Night Is When Worry Takes Over

There is a second mechanism at work, beyond neurobiology, and it is almost architectural. During the day, your attention is continuously structured by external demands — conversations, tasks, decisions, movement, the presence of other people. These are not just distractions. They are anchors, interrupting the pull of unresolved worries before they can take hold and build momentum.

At night, the external scaffolding falls away. There is silence. There is stillness. And the brain, freed from its daytime responsibilities, does what it does in any open space: it begins filling in unfinished business.

This is where the brain's default mode network becomes particularly relevant. The default mode network is the system that activates during rest and self-referential thought — when we reflect on ourselves, imagine the future, or revisit the past. It is most active precisely when external stimulation is lowest. At 3am, it has the room entirely to itself.

For people with a tendency toward anxiety or rumination, this network does not use the quiet of night for creative reflection or neutral daydreaming. It uses it to return, repeatedly, to unresolved concerns — circling them, re-examining them, generating increasingly catastrophic interpretations. One worry triggers another. A thought about a relationship difficulty connects to a fear about abandonment, which connects to a memory of an earlier loss, which arrives at the conclusion that you are fundamentally unlovable. In under five minutes.

Researchers Nota and Coles found that shorter sleep duration and longer time awake in bed were directly associated with difficulty disengaging attention from negative emotional material. In other words, wakefulness at night doesn't just expose you to worried thoughts — it makes those thoughts harder to escape.

Clinicians sometimes call this bedtime the "rumination window." It is the moment in the day when all the worry that was held at bay by activity and engagement finally gets its turn.

Why the Midnight Mind Feels So True

One of the most clinically important features of nighttime catastrophizing is its convincingness. These are not thoughts that feel like distortions. They feel like clarity. They feel like the moment you are finally seeing things as they really are, stripped of the comforting illusions you tell yourself by daylight.

This is precisely what makes them so difficult to dismiss.

The feeling of certainty that accompanies nighttime thinking is itself a product of the cognitive state that generates it. When the prefrontal cortex is underperforming, the metacognitive capacity that allows you to observe your own thinking — to notice a thought and evaluate whether it is accurate or distorted — is also impaired. You cannot easily hold a catastrophic thought at arm's length and assess it. Instead, you are immersed in it.

What circadian researchers describe as "emotional reasoning" — the cognitive pattern in which feelings are treated as facts — is at its most powerful at night. I feel like everything is falling apart becomes Everything is falling apart. The terror feels like evidence.

Add to this the neurobiology of prolonged wakefulness — shifts in neurotransmitter activity, rising levels of stress hormones, declining executive function with each passing hour awake — and the midnight mind's horror stories become functionally indistinguishable from reality in the moment they are experienced.

The Vicious Cycle: How Worry and Sleep Deprivation Feed Each Other

Perhaps the most clinically significant aspect of nighttime catastrophizing is not any single bad night, but the cycle it can initiate. Research consistently shows that worry interferes with sleep by activating the autonomic nervous system — raising heart rate, increasing cortisol, signaling the body that threat is present and that sleep would be dangerous. The catastrophic thought at 3am is not just psychologically painful; it keeps you awake.

And poor sleep, in turn, worsens the conditions that produce catastrophic thinking the following night. Perlis and colleagues documented the relationship between disturbed sleep and increased psychopathology, noting particular interactions between nocturnal wakefulness and mood dysregulation. Sleep deprivation increases emotional reactivity, impairs prefrontal regulation, and reduces the brain's capacity to process the day's experiences adaptively — leaving more unprocessed material to surface the following night.

This is a well-documented, self-reinforcing loop: nighttime catastrophizing disrupts sleep, disrupted sleep produces more catastrophizing, and the cycle deepens. For people who develop insomnia, this loop is often one of its central maintenance mechanisms.

What Actually Helps

Understanding the midnight mind matters because it changes what the appropriate response is. If these nighttime thoughts were accurate reports of reality, the correct response would be to take them seriously and solve the problems they identify. But if they are the output of a brain state that systematically distorts perception, the appropriate response is different entirely: not problem-solving, but disengagement.

Name what's happening. One of the most powerful tools available at 3am is metacognitive labeling — the act of identifying and naming the cognitive process rather than engaging with its content. "This is catastrophizing." "This is threat amplification." "My brain is doing the thing it does at night." Naming the process creates a small but real distance between you and the thought. You shift from being inside the story to observing the storytelling.

This is not dismissing your concerns. It is accurately identifying the conditions under which they are being generated and adjusting your level of engagement accordingly. You would not trust a diagnosis written at 3am. Extend the same skepticism to your midnight verdict on yourself.

Do not try to solve nighttime problems at night. The impulse to mentally work through a concern — to plan, prepare, rehearse, resolve — feels productive. It rarely is, at that hour. The prefrontal resources required for genuine problem-solving are not fully available. What happens instead is that the problem is turned over and over without resolution, each circuit through it deepening the sense of urgency and hopelessness.

A more useful response is deferral with intention. Write down the concern briefly — a single sentence in a notepad by the bed — and make a genuine commitment to address it in the morning, when you have the cognitive resources to do so. This is not avoidance. It is scheduling. And for many people, the simple act of writing it down reduces the brain's perceived need to hold it in active memory.

Attend to your nervous system rather than your thoughts. Prolonged wakefulness with anxiety activates the sympathetic nervous system — the body's threat response. Attempting to think your way out of this state is effortful and often counterproductive. Slow, rhythmic breathing — particularly with extended exhales — directly activates the parasympathetic system, beginning to shift the physiological state that is amplifying the catastrophizing. You are not just calming yourself down. You are changing the neurological environment in which the thoughts are occurring.

Establish a wind-down routine that reduces the evening backlog. Much of what surfaces at night is material the day didn't provide space to process. Brief journaling, a worry window earlier in the evening, or simply time to reflect on the day before bed can reduce the volume of unfinished business the default mode network has to work with overnight.

When Nighttime Catastrophizing Becomes Something More

For many people, occasional 3am spirals are exactly that — occasional. They correlate with periods of stress, poor sleep, or high-stakes life circumstances, and they resolve when those circumstances shift.

But for others, the pattern becomes persistent. Nights are consistently dreaded. The dread itself begins to prevent sleep. The catastrophizing extends beyond the night hours into the day. The loop of anxious thinking and disrupted sleep tightens into something that clinical work is needed to untangle.

Cognitive Behavioral Therapy for Insomnia (CBT-I) directly targets the cognitive and behavioral patterns that maintain this cycle — including the beliefs about sleep and thinking that keep people awake, and the specific cognitive distortions that characterize nighttime rumination. For anxiety that extends more broadly into daily functioning, therapy can address the underlying worry patterns that make the midnight hours particularly fertile ground for catastrophe.

If you recognize your nights in this description — if the 3am mind is a familiar and exhausting presence — that is worth taking seriously. Not because something is fundamentally wrong with you, but because the loop is treatable. The midnight mind is loud and convincing. It is not, however, accurate. And you do not have to take its word for it.

Citations

Nota, J. A., & Coles, M. E. (2017). Shorter sleep duration and longer sleep onset latency are related to difficulty disengaging attention from negative emotional images in individuals with elevated transdiagnostic repetitive negative thinking. Journal of Behavior Therapy and Experimental Psychiatry, 54, 170–178. https://doi.org/10.1016/j.jbtep.2016.08.009

Perlis, M. L., Grandner, M. A., Chakravorty, S., Bernert, R. A., Brown, G. K., & Thase, M. E. (2016). Suicide and sleep: Is it a bad thing to be awake when reason sleeps? Sleep Medicine Reviews, 29, 101–107. https://doi.org/10.1016/j.smrv.2015.10.003

Tubbs, A. S., Fernandez, F.-X., Grandner, M. A., Perlis, M. L., & Klerman, E. B. (2022). The mind after midnight: Nocturnal wakefulness, behavioral dysregulation, and psychopathology. Frontiers in Network Physiology, 1, 830338. https://doi.org/10.3389/fnetp.2021.830338

What Olympic Athletes Teach Us About Sleep Anxiety

If you've ever lain awake the night before something important — a job interview, a first date, a difficult conversation — you already have something in common with Olympic athletes.

A recent New York Times piece published during the 2026 Milan Cortina Winter Games highlighted something that might surprise you: nearly 40 percent of Team U.S.A. athletes reported poor sleep in a 2024 study. These are the most physically conditioned people on earth, preparing for the highest-stakes performances of their lives — and they struggle to sleep just like the rest of us.

What sports psychologists are teaching these athletes has a lot to offer anyone dealing with sleep anxiety, nighttime rumination, or the exhausting cycle of trying too hard to rest.

The Paradox of Sleep Effort

One of the central findings in how Olympic psychologists approach sleep is counterintuitive: the harder you try to sleep, the worse it often gets.

Dr. Emily Clark, a psychologist for the U.S. Olympic and Paralympic Committee, advises athletes to aim for consistency, not perfection. That distinction matters more than it might seem. When sleep becomes a performance — something to optimize, achieve, or win — it takes on the same qualities as wakefulness. Your nervous system stays alert. Your mind monitors. Your body waits.

This pattern has a clinical name: sleep effort. It's a well-documented contributor to chronic insomnia, and it's the same trap elite athletes fall into when they check their sleep tracker scores in the morning and treat the number as a verdict on their day.

The antidote isn't indifference to sleep. It's reducing the stakes you've attached to it.

What Nighttime Rumination Actually Is

Moguls skier Tess Johnson described what many of my patients describe almost word for word: waking in the middle of the night and replaying scenarios — past performances, future fears, imagined outcomes. "I'll find myself waking up in the middle of the night, just kind of ruminating," she said.

Nighttime rumination isn't a character flaw or a sign that something is wrong with your thinking. It's what happens when your brain hasn't had a chance to process the day's emotional content before you ask it to go offline.

For athletes, that content is competition pressure. For the rest of us, it might be work stress, relationship tension, parenting worry, or financial anxiety. The mechanism is the same: your threat-detection system doesn't have an off switch, and nighttime is often the first quiet moment it has to run through its backlog.

What helps? The same techniques Olympic sleep consultants recommend:

Box breathing or slow, rhythmic breathing before bed to signal the nervous system that it's safe to downshift

A consistent wind-down routine that avoids emotionally activating content (yes, that means the doom-scrolling and high-stakes TV shows)

Journaling or a "worry window" — giving your brain a designated time to process concerns earlier in the evening, so it doesn't reserve that work for 2am

Anchor Your Wake Time, Not Just Your Bedtime

One of the most practical takeaways from how Olympic psychologists work with athletes is the emphasis on a consistent wake time rather than a fixed bedtime.

Dr. Jim Doorley, another USOPC psychologist, explains that your wake time is the most powerful anchor for your circadian rhythm — especially combined with morning light exposure. Bedtime can be flexible depending on when you're actually sleepy. Wake time should stay stable.

This is consistent with what we know from Cognitive Behavioral Therapy for Insomnia (CBT-I), which is the gold-standard, evidence-based treatment for chronic sleep difficulties. One of its core components — sleep restriction — works precisely because a consistent wake time gradually rebuilds sleep drive and consolidates fragmented nights.

If you're lying in bed for nine hours but only sleeping six of them, the bed has become a place of wakefulness as much as sleep. A stable wake time, even on weekends, starts to change that association.

Your Body Is More Resilient Than You Think

Perhaps the most therapeutically important message in how the USOPC approaches sleep is this: one bad night doesn't ruin everything.

Their sleep guidelines explicitly state that a single night of poor sleep "is rarely enough to derail your performance when you have adrenaline on your side and good sleep banked from prior nights." Dr. Doorley encourages athletes to cultivate what he calls a "childlike relationship to sleep" — sleeping when tired, not overthinking it, letting go.

This is easier said than done, especially for people who have spent months or years in a fraught relationship with their bed. But it points toward something real: much of what maintains insomnia isn't the original sleep disruption. It's the catastrophic meaning we assign to it.

"I didn't sleep — tomorrow is ruined." "If I don't fall asleep in the next twenty minutes, I won't function." "Something must be wrong with me."

These thoughts are understandable, but they're also treatable. CBT-I and other evidence-based approaches directly target the cognitive distortions that keep the sleep anxiety cycle running.

When to Seek Support

If you recognize yourself in any of this — the rumination, the sleep effort, the dread of bedtime — it's worth knowing that sleep anxiety and insomnia are among the most treatable conditions in mental health.

You don't have to be an Olympian managing peak performance to deserve good sleep. And you don't have to keep white-knuckling through it.

If sleep difficulties are affecting your mood, your relationships, your work, or your quality of life, that's a signal worth taking seriously — not as a personal failure, but as information that your system needs something different.

Citation

Huber, M. F. (2026, February 7). 5 Sleep Habits to Steal from Winter Olympians. New York Times. https://www.nytimes.com/2026/02/07/well/sleep-winter-olympics-athletes.html