How to fix your sleep schedule: a step-by-step reset

To fix your sleep schedule, pick a wake-up time you can keep seven days a week, get bright light soon after you get up, keep your evenings dim, stop caffeine early and move the whole schedule 15 to 30 minutes at a time. The wake time moves first because it's the part you control; nighttime sleepiness follows it. If you've had trouble sleeping at least three nights a week for three months, it may be insomnia, which has its own first-line treatment (more on that below).

How a sleep schedule falls apart

Nobody decides to fall asleep at 3 a.m. It happens in installments: one season finale, a week of scrolling in bed, a Saturday that starts at noon, an afternoon coffee to survive the Monday after. Sleep schedules rarely break all at once. They get neglected, like houseplants, until one day you notice the damage.

Your body clock adjusts to whatever you feed it, and what it eats most is light. The NIH's fact sheet on circadian rhythms says light and dark have the biggest influence on them, and that light from electronic devices at night can confuse the body's clocks. Late screens and bright evenings push your clock later, and mornings spent in a dark bedroom do nothing to pull it back.

Weekends finish the job. In 2006, Marc Wittmann, Till Roenneberg and colleagues gave it a name, social jetlag: the gap between when your body sleeps on free days and when work or school gets you up. Sleep until noon on Sunday and Monday's alarm feels like it was set by someone who hates you.

Step one: choose a wake-up time and guard it

Your bedtime is a wish. Your wake time is a decision. Pick the time you need to be up on work or school days and use it every day, weekends included. The CDC's tips for better sleep start right there, with going to bed and getting up at the same time every day, and the NHS adds the part everyone skips: get out of bed at that time too.

Hold it even after a bad night. Sleeping in to make up for it pushes the next bedtime later, and you're back at the start. Getting up on time after a rough night is unpleasant, but it builds the sleep pressure that makes the following night easier.

How fast you move depends on how far off you are:

• Gradually. Shift your wake time, and your bedtime with it, 15 to 30 minutes earlier every day or two. The American Academy of Sleep Medicine gives the same kind of advice for the daylight saving change: move bedtime 15 or 20 minutes earlier each night. If a step leaves you dragging all day, hold it for a few days before taking the next one.
• All at once. Possible, but only with strict rules. In a 2019 study led by Elise Facer-Childs, with researchers from the Universities of Birmingham and Surrey and Monash University, night owls who usually slept from about 2:30 to 10:15 a.m. (22 people took part) were told to wake two to three hours earlier, get as much outdoor light as possible in the morning, limit light at night, eat at fixed times and keep the same schedule on work days and free days. After three weeks, the people following the plan were sleeping and waking about two hours earlier, with no loss of total sleep, and reported less depression and stress.

The fast route works if you follow every rule. The slow one is more forgiving of real life.

Step two: light is the remote control

Morning light tells your clock the day has started; bright evening light tells it the day isn't over. The American Academy of Sleep Medicine's advice for the time change is to get outside for early morning sunlight, because bright light helps set your internal clock. So:

• Get outside, or at least next to a window, soon after you get up. Walking to get coffee counts.
• Open the curtains before you open your apps.
• In the evening, switch from ceiling lights to lamps and turn your screen brightness down.
• Put screens away at least 30 minutes before bed (the CDC's suggestion) and charge the phone outside the bedroom so it isn't a nightly negotiation. If the phone is the real villain, see how to stop scrolling.

Step three: caffeine, naps, alcohol and late dinners

These are the quiet saboteurs. They work against you while you're busy blaming the series.

• Caffeine. In a 2013 study led by Christopher Drake, 400 mg of caffeine taken six hours before bed still cost healthy sleepers more than an hour of sleep on an in-home monitor, and their own reports suggested they hadn't noticed. The authors' advice is no substantial caffeine for at least six hours before bed, and it was a small study (12 people), so treat six hours as the floor. Going to bed at 11 means the last coffee is around 5, earlier if caffeine hits you hard. Energy drinks and black tea count too.
• Naps. While you're resetting, skip them, or keep them short and early in the afternoon. A long nap at 6 p.m. is a second night, and it pushes the real one later.
• Alcohol and big meals. The CDC lists both among the things to avoid before bedtime.
• Exercise. Regular exercise is on the CDC's list too. If a hard workout at night leaves you wired, move it earlier.

Step four: let bedtime come to you

You can't make yourself fall asleep at 10 p.m. because you decided to at 4 p.m. The NHS advice for insomnia is to go to bed only when you're sleepy, and it works for a schedule reset too. With a fixed wake time and morning light, the sleepiness starts showing up earlier, a little at a time.

Until it does, use the last hour to wind down: dim lights, the same boring steps in the same order (our night routine guide has a template) and nothing that ends with "just one more episode." If you're lying in bed wide awake and getting frustrated, get up, do something dull in dim light and go back when you're sleepy. Arguing with the ceiling rarely ends well.

Weekends: the lie-in trap

An extra hour on Saturday is a treat. Four extra hours undoes the whole week, and on Sunday night you'll lie there wondering why you're not tired. Keep your weekend wake time close to your weekday one, and if you need more sleep, get it by going to bed earlier instead of sleeping until noon.

And no, an all-nighter won't reset anything. It usually buys you a wrecked day and a long afternoon nap that pushes the next night later. The boring plan is the fast plan.

When it's not the schedule

Sometimes you do everything right and still lie awake. If you have trouble falling asleep, staying asleep or waking too early at least three nights a week for three months or more, the American Academy of Sleep Medicine calls that chronic insomnia, and its first-line recommended treatment is cognitive behavioral therapy for insomnia, or CBT-I. The American College of Physicians reached the same conclusion in its 2016 guideline, recommending CBT-I as the initial treatment for adults with chronic insomnia. The NHS notes it can be done face to face or through an online program.

See a doctor if changing your habits hasn't helped, if you've had trouble sleeping for months, or if it's making daily life hard to cope with. Don't just grit your teeth through it: this isn't a discipline problem, and nobody here is going to roast you for it. If sleepless nights come with low mood, or you're carrying something heavy, the free, confidential helplines on our support page are there for exactly that.

Start with one number

Choose your wake-up time and set it for all seven days. Move the phone charger out of the bedroom. Decide where tomorrow's morning light comes from: a window, a balcony, the walk to the bus. Then go to bed when you're sleepy and get up when the alarm says so, even if tonight goes badly. That's the whole trick, repeated until it sticks. If early mornings are the real goal, how to wake up early picks up where this leaves off.