How to fix your sleep schedule, and why going to bed early doesn't work

Why your schedule keeps sliding later

There’s a timekeeper in your brain that runs your day. It sets when you get sleepy, when your temperature dips, and when melatonin starts flowing in the evening. The odd thing about it is that it doesn’t quite run on 24 hours. When people are kept away from clocks and daylight for weeks so the timekeeper can run on its own, it averages about 24 hours and 9 minutes. Most people’s runs a little long like that. A minority, more often women than men, have one that runs a little short.

So think of it as a watch that gains nine minutes a day. That’s fine as long as somebody sets it every morning. Skip the setting for a month and it’s four and a half hours out. The somebody, for your clock, is daylight, and in real life the drift runs faster than nine minutes a day, because the light you sit in at night pushes in the same direction.

Light does the setting like this. Light that reaches your eyes in the hours after you wake pulls the clock earlier. Light late in the evening and into the night pushes it later. The switch between the two sits near the low point of your body temperature, which comes about three to four and a half hours before the time you’d naturally wake up. If you’ve been falling asleep at 3 AM and waking at 11, that low point is somewhere around 7 or 8 in the morning, and every hour of light before it, from the monitor at midnight to the hallway light at 2, is an hour of light telling the clock to run later.

Now look at a normal modern day through that. Dim indoors from nine to five, then the brightest light of the whole day, an arm’s length from your face, at midnight. When researchers took eight people camping in the Colorado mountains for a week with no electric light, only daylight and a campfire, the point in the evening where their melatonin started to rise moved about two hours earlier than it had been after a normal week of offices and lamps, and it lined up with sunset. The people whose clocks had been latest moved the most.

You can’t camp every week, which is why the next finding is the one to hold on to: the clock follows your wake time, because the wake time decides when the morning light reaches you. In a lab in Chicago, fourteen healthy adults kept the same bedtime for two weeks but woke three hours later than usual, and their melatonin rhythm moved 2.4 hours later. Late nights push too, even with a normal morning: in an earlier study, two or three weeks of 1 AM bedtimes instead of 10 PM, with the lights on at 7 and a few minutes outside, still moved it a little over half an hour. Both ends of the night push the clock, and in those two studies the morning end pushed harder.

Screens push as well. When twelve people in a sleep lab spent the four hours before bed reading on a light-emitting e-reader for five nights, against five nights with a printed book, their melatonin rise came an hour and a half later, they took about ten minutes longer to fall asleep, and they were sleepier the next morning. The light is part of it. The other part is that the thing on the screen is more interesting than the ceiling, and nobody has to be talked into one more match. If what keeps you up isn’t the game so much as a refusal to let the day end, because the hours after midnight are the only ones that belong to you, that has a name, revenge bedtime procrastination, and it’s less a sleep problem than a putting-things-off problem, which we cover in how to stop procrastinating.

Caffeine moves the clock too, not only your sleep: a double espresso’s worth three hours before bed delayed the melatonin rhythm by about 40 minutes in a lab study.

Some of it is built in. Hundreds of common gene variants nudge people earlier or later, and age moves everyone: in a nationally representative survey of American sleep times, people were at their latest at 18 and 19, and crept earlier from there for the rest of their lives. So if you’ve been a night owl for as long as you can remember, some of that is real. What you can change is where the light lands, and so far it has been landing at the wrong end of the day.

Why going to bed early doesn’t work on its own

If the clock is set to 3 AM and you get into bed at 11, you’re not just a bit early. You’re trying to fall asleep hours before your body starts getting ready, and heading into the hardest stretch of the whole day to do it.

In the few hours before your usual sleep time, the clock’s drive to keep you awake is at its strongest. The researcher who mapped it hour by hour called that stretch the forbidden zone for sleep, which is about how it feels at 11:30 with your eyes shut. Melatonin, the hormone that opens the door, only starts rising about two hours before you normally drop off. For a 3 AM sleeper that’s around 1. At 11 PM the door isn’t just closed. It’s locked, with you standing outside it, exhausted.

Exhausted and wide awake at the same time is possible because two separate things decide sleep. One is pressure: the longer you’ve been up, the more it builds, and after a five-hour night it’s heavy by 11 PM. The other is the clock, which says it’s still evening as far as your body is concerned. Pressure makes you tired. The clock decides whether you can act on it, and in the forbidden zone the clock wins.

Lying there has a cost beyond the lost hour. Do it night after night and, as the insomnia specialists see it, your brain starts filing the bed under “the place where I lie awake”, which is the beginning of a different problem. The standard treatment for insomnia has rules about this for exactly that reason: go to bed when you’re sleepy, not by the clock, and get up at the same time every day whatever the night was like.

Will an all-nighter reset it?

It’s the most asked question on this subject, and I understand why. It feels like a hard reset: stay up through the night, be so wrecked by 10 PM that you fall asleep instantly, wake up at 7, done.

If it works at all, it works for one night, and it works through pressure, not the clock. By the second evening you’ve been awake for 40 hours, and that much pressure can flatten you at any hour. Nothing in it moves the clock earlier. If anything it pushes the other way, because you spent the whole night in light during the hours that push it later, and you were probably asleep or napping through the morning hours that would have pulled it earlier. As we read the studies that kept people up all night and then tested their sleepiness every twenty minutes around the clock, the nightly window where sleep comes easily opened at its usual time all the same. So the night after the good night you’re back outside the locked door, with a day of lost performance behind you: one night without sleep leaves people roughly as sharp as a week of six-hour nights does, and most of them don’t notice.

So the bedtime isn’t the lever. The other end of the night is.

How to move your clock back

Everything below starts from the morning. How fast you can go depends on you, and the plan should bend to how you’re sleeping and functioning rather than the other way round.

Know your gap. Write down when you actually fall asleep and wake up on a normal day this week, not when you’d like to. If you’re asleep at 3 and up at 11, and the life you want needs you up at 7, the gap is four hours, and it isn’t going to close in a night. The log is your starting line, and later it’s how you’ll know whether the pace is right.

Move the alarm, not the bedtime. In the labs that move clocks on purpose, the schedule shifts an hour a day, with bright light boxes for the first hours after waking and a timed pill, and the clock keeps up at about an hour a day. At home, with daylight and an alarm, expect less. A reasonable place to start is half an hour to an hour earlier every day or two, and then let two things set the pace: how quickly you’re falling asleep at the new time, and how you’re functioning in the day. If you’re still lying awake for an hour, you’re probably moving faster than your clock, so hold the alarm where it is for a few days. Earlier is also the harder direction. In the jet lag research the clock delays about an hour and a half a day and advances about one, which is why a late week slides you back faster than a good week brings you forward.

Get light within the first hour, outside if you possibly can. This is the step that does most of the moving, and it’s the one people skip because it sounds too simple. Twenty to thirty minutes outdoors soon after the alarm is a reasonable aim: a walk, a coffee on the step, the bus stop without sunglasses. The reason it has to be outside is strength. Daylight runs to a thousand lux and far beyond, the lamps in a normal home give about 30 in the evening, and the researchers who wrote the current light recommendations set a daytime minimum at the eye that daylight clears without trying and a living room often doesn’t. If it’s December and dark until eight, a bright light box over breakfast is the next best thing; timed morning light is a standard treatment for the clinical version of a late clock, and in one study that combined light boxes, a timed afternoon pill and an alarm moving an hour a day, a single 30-minute session of light did three quarters of the work of two hours.

One warning for the badly delayed. Light only pulls the clock earlier if it lands after that temperature low point. If you’re currently sleeping until noon and you heroically stand in the garden at 7 AM on day one, that light arrives before the low point and can push you later still. That’s our reading of the light research, and it’s the reason the labs move the schedule in steps rather than in one jump. So the light goes with the alarm, soon after whatever your wake time is this week, and the two move earlier together.

Let the bedtime follow. Go to bed when you’re sleepy, not when the plan says. While the alarm is moving and the bedtime hasn’t caught up, your nights will run a little short, and that’s part of how it works: the extra pressure is what brings the bedtime earlier. A little short, for a few days, is all the plan asks. Adults need seven hours or more, the point of the exercise is to end up getting them, and if you’re well under that for more than a couple of nights, or struggling to stay awake in the day, the plan is moving faster than you are. Fix that by slowing the alarm, not by sleeping in: move it back half an hour and hold there until you’re falling asleep earlier, because a regular wake time is what keeps the morning light working, and an unplanned late morning gives the clock its old light back. If you drive for a living or do work where a lapse matters, go slowly from the start. If you’re lying there awake, get up, keep the lights low, do something dull, and go back when you’re sleepy. And if weeks of short nights have already left you with no energy for anything on your list, that’s not a character problem either; we wrote about what being worn down does to motivation.

Turn the evening down. From about three hours before the bedtime you’re aiming at, make the room dim: lamps instead of the ceiling light, the monitor and the phone a lot darker and warmer, the lights off in the rooms you walk through. Nobody is asking you to stop playing. The late session is the one thing most people in this situation actually enjoy, and I wouldn’t bet on a plan that bans it. Dim the room instead, drop the screen brightness as far as you can stand, and give the last hour before bed to something that doesn’t light your face.

Set a caffeine cutoff, and set it earlier than feels natural. In the one study that tested timing carefully, 400 mg of caffeine, which a large coffee-shop coffee can carry, taken six hours before bed still cut the night’s sleep by more than an hour, and the US National Institutes of Health put the cutoff for people resetting a rhythm at eight hours before the bedtime they want. For an 11 PM target, that’s the last coffee or energy drink by mid-afternoon.

Naps, if you need one, short and early. A nap spends the pressure you need for tonight, which is why the guidance on resetting a rhythm says to avoid them, especially in the afternoon. If a short night has left you unsafe to function, a brief nap, twenty minutes or so, early in the afternoon, takes the edge off at the least cost. A long nap at 6 PM is tonight’s sleep, borrowed.

Train when you train, with one tweak. Evening sessions didn’t hurt sleep for most people in the trials, as long as the hard part finished an hour or more before bed. But in the one study that timed it, a session between 7 and 10 PM nudged the clock later, while a morning or early-afternoon session nudged it earlier, so while you’re moving the clock, earlier is the better slot if you have the choice.

If you’d rather have a coach set the mornings up with you and keep you honest through the first weekend, that’s part of what we do at Gains For Gamers.

What it could look like, day by day

Say you fall asleep at 3 AM and wake at 11, and you need to be up at 7. Here is how the pieces might sit on a calendar if you moved the alarm half an hour a day. It’s a picture of the order, not a forecast: nobody can tell you from here which night you’ll fall asleep earlier or when it will stop feeling like effort, and the pace is yours to slow.

Moving a 3 AM sleeper to 11 PM, with the pieces in order

You’ll miss mornings. One missed morning doesn’t undo the work; a run of them does. In our coaching we aim for most mornings rather than all of them, because most is what people keep up.

Weekends, where most resets come undone

You’ll recognize the pattern. The week goes fine. Friday night runs late because it’s Friday, Saturday you sleep until noon because you can, and on Sunday night you’re wide awake at 1 AM wondering what happened. What happened is that your clock moved.

Researchers call the gap between your weekday sleep and your weekend sleep social jet lag, because that’s what it is: a flight to a time zone two hours west on Friday and back again on Sunday, every week. Most working adults have some. In a very large survey it went with a higher body weight, independently of how much people slept.

How far a weekend moves the clock has been measured, at least for a weekend of a known size. Ten young adults who shifted their sleep two hours later on a Friday and Saturday night had their melatonin rhythm come 32 minutes later by Monday. Teenagers who went to bed an hour and a half later and woke three hours later on a weekend moved about 45 minutes. A wilder or tamer weekend than those moves you more or less, but the shape is the same: Sunday night’s bedtime arrives later than Friday’s did, and the week starts with you making it back up.

Sleeping in does pay something back. In a Swedish study that followed nearly 44,000 people for thirteen years, those under 65 who slept short on weekdays but long at weekends were no more likely to die early than people who slept a normal amount every night, while people who slept short every night were. So the hours matter, and as far as that study can tell, catching some of them up is better than not. What a weekend couldn’t do, at least in the lab, is undo the week: when healthy young adults slept five hours a night for a working week and then as long as they liked at the weekend, their insulin sensitivity still fell in the days after it, and their clocks came out of the weekend later than they went in.

So here’s the honest version. A late weekend costs you something in that range, half an hour to three quarters of an hour, paid on Sunday and Monday night. While you’re still moving your clock, that’s the time to keep the alarm close to the weekday one. Once the clock has settled, you can afford a late night now and then, as long as you pay for it on purpose: up within an hour or so of your weekday time, outside, and bed when you’re sleepy rather than an hour early to make up for it. Don’t expect a small lie-in to be free, either. In the teenager study, waking only an hour later and napping after lunch let the clock drift about as much as the full lie-in did, and so did an hour of bright light on waking. The thing to ration is the late night itself. How often you can afford one is a judgment about your week, and not a rule I can hand you.

Should you take melatonin?

Someone will suggest it, so here’s what it is and isn’t. Melatonin is the hormone your clock releases in the evening, and as a pill it does two things: it’s a timing signal that can nudge the clock, and it makes you a bit drowsy. The timing is the whole trick. In the lab studies, a small dose taken in the late afternoon or early evening, hours before sleep, pulled the clock earlier, while a dose at bedtime did little to the clock at all. The sleep medicine guideline for the clinical version of a late clock, delayed sleep-wake phase disorder, backs timed melatonin for adults who have the condition, at its weaker level of confidence, and a 2018 trial in diagnosed patients found that a small dose an hour before the target bedtime, on a fixed schedule, got people to sleep about half an hour earlier than a placebo did.

Two practical things. In the United States melatonin is sold as a dietary supplement, which means the pill isn’t checked the way a medicine is, and the dose and purity vary between brands. When Canadian researchers tested 31 products bought in shops and pharmacies, most contained a different amount than the label said, from almost none to nearly five times as much, and a quarter contained serotonin, which has no business being in there. In the UK it’s prescription-only. So if you want to try it, that’s a conversation with a doctor or a pharmacist about dose and timing, not a guess from a bottle, and it isn’t a substitute for the mornings. The light does the heavy lifting either way.

When it isn’t a habit problem

This page assumes your clock slid through habit, because that’s the common case and the one a plan like this can reach. Some readers have something else going on, and no amount of morning light will touch it. Four things worth knowing the shape of, so you don’t spend a month fighting the wrong one.

• The clock moves and then fights its way back. If you’ve done the mornings properly for two or three weeks, light and all, and your sleep still won’t come before 2 or 3, or it moves and then slides straight back the moment you relax, and this has been going on for three months or more, that’s the pattern of delayed sleep-wake phase disorder. The giveaway is that your sleep itself is fine whenever you’re allowed to follow your own timing; the problem is only the mismatch. It’s a recognized condition, it’s treatable, and it’s a doctor’s job, ideally a sleep clinic’s.

• You can’t sleep at any time. If you lie awake at 3 AM as well as at 11, wake several times a night or wake early and can’t get back, most nights, for three months, and the days are a wreck, that’s insomnia rather than a schedule. The treatment with the strongest evidence behind it is a structured course called cognitive behavioral therapy for insomnia, not a new alarm. See your doctor.

• You sleep plenty and still wake wrecked. Loud snoring, gasping or choking in the night, breathing that stops and starts, a headache on waking, exhaustion through the day however long you slept: those are the signs of sleep apnea, and no schedule fixes a blocked airway. A doctor, soon, and bring whoever has heard you sleep.

• Nothing has felt like anything for a while. If the late nights come with a flat mood, and the things you normally enjoy have done nothing for you most of the day, every day, for more than two weeks, the sleep is probably a symptom rather than the cause. That’s one for a doctor too, and sooner than you’d think.

And one that isn’t a problem at all. If you sleep from 3 to 11, you get your eight hours, your work starts at noon and you feel fine, you don’t have a sleep schedule to fix. You have a late one. The research that worries about night owls is mostly about the mismatch between their clock and their obligations, not the clock itself, and a late clock you can live with, kept the same all week, is a schedule like any other.