Sleep calculator
This sleep calculator suggests bedtime and wake-up times from 90-minute cycles plus the minutes you need to fall asleep. Set one clock time, and the six cards are the other end of those cycles.
sleeptimer
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This sleep calculator suggests bedtime and wake-up times from 90-minute cycles plus the minutes you need to fall asleep. Set one clock time, and the six cards are the other end of those cycles.
A sleep cycle is often about 90 minutes, but the real length varies by person and can shift during the night. sleeptimer uses that average to suggest a clock time. It is a planning guide, not a reading of your sleep.
Onset is the number of minutes you usually need to fall asleep. Bedtime suggestions move earlier by that amount, and wake-up suggestions move later, so they match when you are actually asleep. Change it in settings and the six suggestions update on this device right away.
This page only adds and subtracts time. It does not use a microphone, a watch, or any sensor, and it cannot tell light sleep from deep sleep.