Sleep Calculator
Calculate the optimal bedtime or wake-up time based on sleep cycles.
Um optimal ausgeruht aufzuwachen:
21:46 Uhr
6 Sleep Cycles
9 Stunden Schlaf
Empfohlen23:16 Uhr
5 Sleep Cycles
7.5 Stunden Schlaf
Empfohlen00:46 Uhr
4 Sleep Cycles
6 Stunden Schlaf
Note: A sleep cycle lasts approximately 90 minutes.
- Ein Schlafzyklus dauert ca. 90 Minuten
- Optimal sind 5-6 Zyklen (7,5 - 9 Stunden)
- Aufwachen zwischen Zyklen fuehlt sich erholsamer an
- Ca. 14 Minuten Einschlafzeit eingerechnet
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
Frequently Asked Questions
How much sleep do adults need?
Adults typically need 7-9 hours of sleep per night. Sleep cycles last about 90 minutes, so planning sleep in multiples of 90 minutes (e.g., 7.5 hours) can help you wake feeling refreshed.
What time should I go to bed?
Count back from your wake time in 90-minute sleep cycles. For a 6:30 AM alarm, ideal bedtimes are 9:00 PM (6 cycles), 10:30 PM (5 cycles), or midnight (4.5 cycles), plus 15 minutes to fall asleep.
What is the Sleep Calculator?
The sleep calculator computes optimal sleep and wake times based on sleep cycles of approximately 90 minutes.
How does the Sleep Calculator work?
Enter your desired wake-up time or bedtime. The calculator computes optimal times in 90-minute cycles so you wake at the end of a cycle and feel rested. The time to fall asleep (approx. 15 min) is factored in.
Key Data and Facts
Sleep cycle: approx. 90 minutes. Recommended cycles: 5-6 per night (7.5-9 hours). Recommended sleep for adults: 7-9 hours. Average time to fall asleep: 15 minutes.
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