How to sleep better, ranked by the evidence

This is what works, in plain terms: a wake time that doesn't move at the weekend, and time in bed that roughly matches the sleep you get. Daylight and movement before lunch, and a dark and quiet room. An evening that slopes down instead of stopping dead.

And this is what doesn't do much: blue-light glasses, and a lie-in to make up for a bad week. A sleep hygiene checklist on its own isn't much better. None of them is harmful; they're just where most of the effort goes, for the least return.

Maybe you've tried half of this already and still sleep badly. That isn't a failure of effort. Most sleep advice is a flat list, with the strong habits and the weak ones side by side, so you can't tell which to bother with.

After a few bad nights you sit through the 9am meeting without taking any of it in. You snap at whoever asks a question afterwards, and by mid-afternoon the next night is already a worry.

This guide ranks the habits by how good the evidence is, and says plainly where it's thin. It's the starting point for the rest of the library, so where a habit has its own article, we point you to it.

How we ranked them

Strong means several good trials, or a national guideline, point the same way, and the difference is big enough to feel. Moderate means the evidence leans one way but comes from smaller or older studies. Weak means it's been tested and the results were mixed, or it hasn't really been tested at all.

One more thing before the list. Most of the best trials are in people with long-term insomnia, because that's who gets studied. We come back to that at the end.

What helps you sleep, ranked by the evidence

1. Get up at the same time every day. Strong. Your body clock takes its cue from when you get up and see light, not from when you go to bed. In practice that's your weekday alarm, and the test is Saturday: the same time, or at most an hour later. In a 2024 study, 60,977 UK adults with an average age of 63 wore activity trackers. The most regular fifth had about a 30 per cent lower risk of dying over the following years than the least regular fifth. That's after age, sex, lifestyle and health were accounted for. Regularity predicted it better than hours slept. It's an observational study. It can't prove the regularity did it. But it's why the wake time tops our list, and the NHS agrees: no lie-in after a bad night.
2. Go to bed only when you're sleepy, and get up if you're not. Strong as part of a package; weaker alone. This habit is called stimulus control, and it's part of CBT for insomnia, which the NHS offers long before sleeping pills. The full package is the only thing a 2021 American Academy of Sleep Medicine guideline rates as a strong recommendation. Alone, stimulus control gets a conditional one. Across 20 trials of 1,162 people with long-term insomnia, the package cut the time to fall asleep by 19 minutes. Night waking fell by 26 minutes. Those numbers are for the whole package, not this habit by itself. Bed should mean sleep, not lying awake, so you wait for real sleepiness and keep your time in bed close to the sleep you get. How to fall asleep and stay asleep walks through the whole package night by night.
3. Get daylight and movement in before lunch. Strong for movement. A review of 66 studies found regular exercise had a moderate effect on how well people said they slept. It had a smaller effect on how fast they fell asleep, and it didn't matter much whether the exercise was hard or gentle. The NHS asks for regular daytime exercise, kept out of the four hours before bed. Daylight is the other half. The evidence there is about how the body clock works rather than trials of walks, and morning light explains why the walk goes early.
4. Stop caffeine and alcohol six hours before bed. Strong, in opposite directions. The NHS puts both at six hours. Caffeine keeps you alert for longer than it feels like it does, so it mostly delays the start of the night. Alcohol does the reverse: it gets you off to sleep, then the second half of the night falls apart. That's why a wine-heavy evening ends at 4am with your eyes open. Fall asleep fine but can't stay asleep has the second half in detail.
5. Give the evening a slope. Moderate. The NHS says to relax for at least an hour before bed, and the guideline above gives relaxation its own, weaker recommendation. Your body can't go from a spreadsheet to sleep in four minutes, so the last hour needs lower light and less going on. Nothing with a deadline in it, and no candle-lit production required.
6. Make the room dark, quiet and not too warm. Moderate. The NHS lists noise, light and a room that's too hot or cold among the common causes of insomnia. The fixes are cheap: a thicker curtain and the heating off earlier, with the phone charging somewhere else. None of it needs a decorator.
7. Put the phone down before bed. Moderate. The NHS says not to use devices right before bed. The screen does two things: the light tells your clock it's earlier than it is, and the content keeps your head busy. The evidence is messier than the headlines, because surveys can't separate the screen from the late night that comes with it. Charging it in the hall deals with both.

What has weak evidence

Blue-light glasses

A 2023 Cochrane review found 17 trials, with between 5 and 156 people in each, and results on sleep that pointed both ways. Three trials found better sleep scores with the glasses and three found no difference. The authors couldn't say whether the glasses help sleep at all.

A sleep hygiene checklist on its own

A list like the one above does very little by itself; it needs the wake time and the sleep window to work. The 2021 guideline suggests clinicians don't use them as the only treatment for insomnia. The list isn't wrong; it's the supporting cast.

Catching up at the weekend

A long lie-in on Saturday undoes the habit at the top of this list, because the clock resets to the later morning and Sunday night runs late. The NHS is blunt: stick to your regular hours.

If the weekday time is too much to ask of a Saturday, keep the lie-in to an hour; that's our rule of thumb, not a trial result.

Where the evidence runs out

Almost all the strong evidence above comes from trials in people with long-term insomnia. The 20-trial review we quoted says as much in its small print: the results may not carry over to other sleep problems. If your sleep is only a bit off, the same habits probably still help, and probably by less.

Nobody has run a trial of all seven at once in ordinary sleepers, either. We've ranked by the evidence that exists. Where it's thin, we've said so.

For the second half of the night specifically, how to sleep through the night picks up where this leaves off.

You don't have to do all seven. Pick the top two, hold them for a fortnight, and see what the nights do. If you'd rather not choose, the alarm is the one.