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Sleep Calculator — Best Time to Sleep & Wake

Find the best bedtime or wake-up time based on natural 90-minute sleep cycles.

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Sleep cycle timing is an approximation and varies between people. If you have persistent sleep problems, excessive daytime sleepiness or loud snoring, consult a doctor. Medical disclaimer

What time should I go to bed?

Work backwards from your wake-up time. Sleep runs in cycles of about 90 minutes, and waking at the end of a cycle can help you feel less groggy. Allowing around 15 minutes to fall asleep, five or six cycles (7.5 or 9 hours) suit most adults. For a 6:30 am alarm, that means lights out around 10:45 pm or 9:15 pm.

How this calculator works

  1. 1

    A sleep cycle lasts roughly 90 minutes, though it varies from person to person.

  2. 2

    We allow about 15 minutes to fall asleep.

  3. 3

    We suggest times for 6, 5 and 4 cycles. Most adults need 7–9 hours, so 5 or 6 cycles are recommended.

Frequently asked questions

Short or irregular sleep can affect appetite, cravings, energy and mood, which makes healthy routines harder to keep. Consistent sleep supports overall wellness, including for women managing PCOS, thyroid concerns or weight goals.

Keep regular sleep and wake times, dim screens an hour before bed, avoid heavy meals and caffeine late in the day, and keep your room cool and dark. See a doctor if you have ongoing trouble sleeping or snore heavily.

Structured support

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