Sleep Planner

Work backwards from your alarm to find bedtimes that end on a sleep cycle, plus a wind-down schedule for the hours before.

Editorially Reviewed Updated June 15, 2026

Work backwards from your alarm

Each suggestion ends a roughly 90-minute sleep cycle, which is why waking at one feels less groggy.

What do you want to plan?

The time you have in mind

Minutes it usually takes you to fall asleepMost adults take 10–20 minutes. If it regularly takes more than 30, that is worth mentioning to a clinician.

Choose a time to see suggested schedules.

What this tool can and cannot tell you

The 90-minute cycle is an average. Real cycles run from about 70 to 120 minutes, they change through the night, and they differ between people — so treat these times as a sensible starting grid, not a precise alarm setting.
It cannot measure your sleep. Nothing here knows whether you actually slept, how fragmented the night was, or how much deep and REM sleep you got.
Sleep need is individual. Most adults need seven to nine hours, but a minority genuinely need more, and almost nobody thrives long-term on less than seven despite feeling that they do.
It does not treat a sleep disorder. Loud snoring with pauses, unrefreshing sleep despite adequate hours, or insomnia lasting more than three months needs assessment — not a better bedtime.

Why the time you go to bed is only half the problem

Sleep cycles, sleep pressure and the body clock — and the three levers that actually move sleep quality.

Sleep is not a single state. Across a night you move through light sleep, deep slow-wave sleep and REM sleep in cycles averaging around 90 minutes. Deep sleep dominates the first half of the night and REM the second, which is why cutting the last two hours costs you disproportionately in REM. Waking at the end of a cycle, in light sleep, feels dramatically better than being pulled out of deep sleep 20 minutes earlier — that is the entire premise of this planner.

The two systems you are working with

Sleep pressure builds from the moment you wake, driven by adenosine accumulating in the brain. Caffeine works by blocking adenosine receptors, which masks the pressure without removing it. Running alongside is the circadian clock, a roughly 24-hour rhythm set primarily by light. Morning daylight advances it; bright light in the evening delays it. Good sleep happens when high sleep pressure and the downswing of the circadian rhythm line up. Napping late, sleeping in at weekends, and evening screen light all pull them apart.

How to give yourself a fair chance

Consistency beats duration for most people: the same wake time every day, weekends included, is the single most effective habit, because it anchors the clock. Get outside within an hour of waking. Stop caffeine six to eight hours before bed — its half-life is around five hours, so a 3pm coffee still has a quarter of its dose working at 1am. Keep the bedroom cool, dark and quiet, and keep the last hour dim and screen-free. Alcohol is the common trap: it shortens the time to fall asleep and then fragments the second half of the night and suppresses REM.

When a schedule is not the answer

If you are in bed for eight hours and still exhausted, the problem is quality rather than timing. Loud snoring with witnessed breathing pauses, morning headaches, or falling asleep during the day point towards obstructive sleep apnoea, which is common, treatable, and carries real cardiovascular risk untreated. Difficulty falling or staying asleep at least three nights a week for three months is chronic insomnia — for which the first-line treatment is CBT-I, a structured behavioural therapy, not a sedative.

Frequently asked questions

Are sleep cycles really 90 minutes?

Ninety minutes is a population average. Individual cycles range from roughly 70 to 120 minutes, and they lengthen through the night as REM takes up more of each one. The planner uses the average because it produces sensible options, not because your body follows a metronome.

Can I catch up on sleep at the weekend?

Partially. A long weekend lie-in recovers some of the performance cost of a short week, but it does not undo everything, and it shifts your body clock later — which makes Monday morning harder. A consistent schedule with a short early-afternoon nap when needed works better.

Is it bad to lie in bed awake?

Long stretches awake in bed teach your brain to associate the bed with wakefulness, which is exactly what CBT-I aims to undo. If you are still awake after about 20 minutes, get up, do something calm and dim, and return when you feel sleepy.

Does melatonin help?

Melatonin is a timing signal rather than a sedative. It has reasonable evidence for jet lag and for shifting a delayed body clock, taken in a small dose several hours before target bedtime. For ordinary insomnia the effect is small. Discuss it with a pharmacist or clinician, especially alongside other medicines.

Sources

Centers for Disease Control and Prevention — Sleep — Recommended sleep durations by age
National Heart, Lung, and Blood Institute — Sleep Deprivation and Deficiency — Sleep stages, sleep debt and health effects
American Academy of Sleep Medicine — Clinical guidance on insomnia and sleep-disordered breathing

Health Captain links to primary public-health and clinical sources so you can read the original material yourself. See our sources policy.

About this plannerThis planner suggests times based on average sleep-cycle length. It does not measure or diagnose anything. Persistent insomnia, loud snoring with breathing pauses, or daytime sleepiness that affects driving or work should be assessed by a clinician.

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