Planner

Bedtime and wake-time planner

This planner works backward from the time you need to be up and suggests when to be asleep and when to get into bed. It is for adults who want a starting point for a regular schedule. It is a rough planning aid, not medical guidance, and it cannot tell you how much sleep you personally need.

The rule in words

For each option the planner multiplies the number of cycles (4, 5 or 6) by the cycle length you chose, subtracts that from your wake time to get the time to be asleep, then subtracts your usual time to fall asleep to get the time to be in bed. Example: wake at 7:00 AM, 90-minute cycles, 15 minutes to fall asleep. Five cycles is 7.5 hours, so be asleep by 11:30 PM and in bed by 11:15 PM.

What the evidence does and does not say

Sleep moves through stages in repeating cycles of lighter sleep, deeper sleep and REM sleep. Published descriptions give an average of about 90 minutes per cycle. One federal health institute describes a cycle repeating every 80 to 100 minutes, and other references give a wider range of roughly 70 to 120 minutes, with the first cycle usually shorter and later ones longer. Most nights contain about four to six cycles, and people can wake briefly between them.

That is why the 90-minute figure is only an average. Your own cycles differ from the average, change from night to night, and are affected by age, recent sleep, alcohol and more. None of the sources checked say that timing your alarm to the end of a cycle is a proven way to wake up refreshed, so treat the idea as a loose rule of thumb. What the major health bodies stress instead is getting enough total sleep (for most adults, seven or more hours) and keeping regular sleep and wake times, including at weekends.

How to use the results sensibly

• Pick the option that gives you at least seven hours if you are an adult, and keep your wake time the same every day.
• Treat the times as a starting point. If you consistently feel unrested, adjust by 15 to 30 minutes and see how you feel after a week.
• If you cannot fall asleep at the suggested time, do not lie in bed fighting it. See why you cannot fall asleep at night.
• Shift workers, teenagers, older adults and people with a diagnosed sleep condition may need different timing. Ask a clinician.
• Track how you actually sleep with the printable sleep diary.

Limits

The planner does not measure your sleep, does not diagnose anything and does not know your health, age or medicines. It also does not account for naps, shift work or time zone changes. The numbers are only as good as the cycle length you assume.

Go deeper

• How the body clock works
• How to improve sleep quality
• Questions to bring to your doctor

Where this comes from

The cycle lengths come from published sleep-stage descriptions by the National Heart, Lung, and Blood Institute (80 to 100 minutes, usually four to six cycles a night) and from a sleep-education reference that gives an average of about 90 minutes with a 70 to 120 minute range. The seven-hours-or-more figure and the advice on regular timing come from Centers for Disease Control and Prevention sleep guidance, which gives age-based ranges for adults. The arithmetic is ours and is checked with automated tests across many inputs. Page reviewed October 2026.