Why do I wake up too early and can't get back to sleep?

It's the hour when the window turns from black to gray, and you can tell this waking is for good. It isn't like a waking at 3am. In the middle of the night there's a chance of drifting off again. At five, the night has finished: the body is done with sleep even though you still feel tired, and the day has started without you.

If you're reading this before the alarm, there's nothing you have to do about it yet. Lying still is a fine way to spend it for as long as it feels like rest. If it turns into straining or watching the clock, you can get up. Either way, you could keep the light low: curtains closed, and a dim lamp in place of the overhead one.

When it keeps happening, the mornings start to look alike. The same hour, the same sum of how long until the alarm, and the same answer that it isn't enough. When researchers ask older adults, more than a third in most studies¹1 Duffy et al., 2015 say they wake early or struggle to stay asleep several times a week.

In the last stretch of your night, the light sleeplight sleep The lighter stages of sleep, the drifting doze a small sound can lift you out of. A night spends more time here than in any other stage. of the hour or two before the alarm, most of the pressure for sleep that built up through the day before has already drained away. What keeps you asleep is your body clockbody clock The timekeeper in your brain that runs on a cycle of about a day, setting when you feel sleepy and when you feel alert. Daylight, especially in the morning, keeps it in step with the clock on the wall., whose strongest pull toward sleep comes in the early morning hours, just before your usual waking time¹1 Duffy et al., 2015.

As the years pass, that clock tends to run earlier. Its daily rhythms, such as the rise and fall of body temperature and melatoninmelatonin A hormone your brain releases as darkness falls, telling the rest of your body that night has come. It's also sold as a tablet., run earlier in middle-aged and older adults than in people in their twenties¹, and the change begins even in middle age. So it wakes you earlier too. If your alarm is still set for the old morning, the gap between the two is the hour you lie awake. In older adults that last stretch also seems to be the part of the night most easily broken, as if the clock's early-morning push toward sleep weakens with age¹.

Why the clock moves like this is still largely unknown¹. There's more on how it keeps time in what the body clock is, and how it decides when you're sleepy.

Age is part of it. Across a lifetime, the timing people prefer gets later through the teenage years, peaks around 20, then drifts steadily back toward earlier hours²2 Curtis et al., 2019, until by the eighth decade it's close to where it was in childhood. Mornings that have crept earlier over the years are following a curve that turned somewhere around twenty.

Much of what looks like sleep wearing out with the years turns out to depend on health. When researchers pooled studies of healthy people, the changes that come with age shrank or vanished in those carefully screened³3 Ohayon et al., 2004 for illness, mood disorders, medicines and sleep disorders. One thing still went on falling after 60: the share of time in bed spent asleep. So an early waking that arrives with something else, a new medicine, pain, a low stretch or a bladder that wakes you, is worth looking at for its own sake.

You lost an hour this morning, so tonight you go up an hour sooner, and on paper the sum works. The same study helps explain why it so often doesn't. At home, its older volunteers spent about 8.1 hours in bed but slept only about 6.5 of them⁴4 Klerman & Dijk, 2008. Given sixteen hours a day in bed, their sleep leveled off at about 7.4 hours. The researchers' own reading is that time in bed beyond what you can sleep can itself show up as waking too early⁴.

A longer stretch in bed doesn't add sleep, then. It spreads the same sleep thinner, and the extra wakefulness has to go somewhere. When you go to bed earlier, it seems likely that much of it comes at the far end, so the next morning comes earlier still. This is reasoning from the study, and it hasn't been tested as a result in its own right. It does run the same way as a well-tested treatment for long-running insomniainsomnia Trouble falling asleep, staying asleep or waking too early, that keeps happening and affects how you feel or get on during the day.. Sleep restrictionsleep restriction A part of CBT for insomnia that limits time in bed to about the amount of sleep you're getting at the moment, then widens it as sleep becomes more solid. It's usually guided by a clinician or a tested program. keeps time in bed close to the time slept, so that sleep comes in one more solid stretch⁵5 Edinger et al., 2021, and it only widens the window as sleep fills it. You can read more about that in what CBT for insomnia asks of you.

Light moves your clock, and what it does depends on when it reaches you. Light in the late evening and early night shifts the clock later, light in the late night and early morning shifts it earlier, and light in the middle of the day does little¹⁶1 Duffy et al., 20156 Khalsa et al., 2003. The turning point is the low in body temperature, a few hours before your usual waking time.

So much sleep advice says to get bright light first thing. That suits people whose clocks run late and need moving earlier. Your clock already runs early, though. Bright light at dawn comes after the turning point, so it moves the clock earlier still. Follow that through, and tomorrow's waking would tend to come sooner. For you, the most familiar advice about light pushes the wrong way. The useful light for you comes at the other end of the day, in the evening.

The evening is when most houses begin to dim, and it's the stretch the studies of light have tried to use. The studies are small, and they don't all agree. In one, researchers worked with twenty-four adults who had been waking too early and whose clocks ran early. Some sat through two evenings of bright light, and a comparison group sat in dim red light instead. Those two evenings moved the bright-light group's body clocks about two hours later⁷7 Lack et al., 2005. Over the next four weeks, those people spent less time awake in the night, slept more in total and had fewer days feeling low. They also tended to wake later, though only as a trend.

A second trial went less well. Older adults used light boxes at home, and little changed⁸8 Pallesen et al., 2005. When the American Academy of Sleep Medicine looked at the trials, it suggested evening light only weakly, and only for people diagnosed with a clock running two or more hours early⁹9 Auger et al., 2015, because the evidence is very low in quality. Put together, evening light looks like a hopeful thing to try for yourself: the way light moves the clock is well understood, and the proof that it fixes early mornings is still thin.

If you wake at five and feel you might doze, keeping the room dark and lying still is a reasonable choice. Dawn light pushes an early clock the wrong way, so keeping it out may stop it moving the clock. No one has tested this as a treatment, and the guideline found no evidence either way⁹9 Auger et al., 2015, so heavier curtains, or leaving the blind down until your alarm, are small ways to try it.

If you know from long experience that sleep is over for the night, you can stop fighting for it and get up. Insomnia treatment suggests much the same, getting up when sleep won't come and rising at the same time every morning⁵5 Edinger et al., 2021, so that the bed stays tied to sleep rather than to long stretches awake. There's more on that in whether to get up if you can't sleep. Some people find the early hour becomes their own, with a dim lamp, a warm drink and a book or the window, saved for themselves before anyone else is awake.

People who have had both kinds of early morning say they feel different. One simply comes early. The other comes early with dread, when the first thought is of the day ahead and how to face it.

That second kind has been noticed for a very long time. Physicians in ancient Greece described melancholic people who woke too early¹⁰10 Riemann et al., 2020, long before anyone had a word for depression. Today waking too early is one of the listed symptoms of depression¹¹11 National Institute of Mental Health, 2024. In middle age, it can be one of the ways depression shows. Early waking on its own doesn't mean depression, though, so what matters is whether the early mornings come with other signs.

The signs to notice are low mood, or a loss of interest and pleasure in things you used to enjoy, lasting most of the day, nearly every day, for two weeks or more¹¹. If that sounds like you, it's well worth talking to a doctor, and whatever care you can reach, a family doctor or a local clinic, is a good place to start. Depression is treatable, and sleep often improves as treatment works, though for some people it stays poor¹⁰¹¹.

If the sleep trouble lingers after the low mood has lifted, that's worth raising too, because insomnia that persists is linked to a new episode of depression¹²12 Ohayon, 2002. It can also be treated in its own right. CBT for insomnia is the first treatment guidelines name for insomnia that has gone on a long time, and the evidence that it helps alongside depression is promising¹⁰.

A few ordinary things can bring the morning forward.

If you had a drink in the evening, it may be part of the story. Alcohol helps you drop off and sleep soundly in the first half of the night, but disrupts the second half, at every dose studied¹⁴14 Ebrahim et al., 2013, so an evening drink can show up as a five o'clock waking. There's more in whether alcohol helps you sleep.

If you wake needing the bathroom, that grows common with the years, and waking to pass urine affects about half of people in their 60s¹⁵15 Duffy et al., 2016. As sleep grows lighter toward morning, a filling bladder is more likely to wake you. Sometimes it runs the other way round, and you wake for another reason and then go.

If you're going through the menopause, the early hours may come with night sweats. Trouble staying asleep rises through the menopause, with hot flashes and night sweats a large part of it¹⁶16 Baker et al., 2018, and treating the flashes can help sleep, which is the subject of why sleep can be so hard during menopause.

And if you share a room with someone who rises before you, an eye mask can keep the dawn out where the blind isn't yours to leave down.

You may have read about melatonin for this. The guideline found no evidence to recommend it for an early clock, and the older advice rested on expert opinion alone⁹9 Auger et al., 2015; with melatonin, timing matters a great deal, and the melatonin page explains why.

No study gives a date to expect change, so there's no need to count every night. You'll know whether anything is helping by whether your mornings feel different over a stretch. If nothing shifts, CBT for insomnia or a doctor can take it further.

This evening, you could leave the main lights on through the dishes and the news. And when the early tiredness comes, you could read one more chapter before you go up.