😴Gesundheit
Schlafrechner
Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Waking up between cycles feels more refreshing than being jolted awake mid-cycle.
Go to bed at one of these times:
00:46
4 cycles
6.0 hrs
23:16✓ Recommended
5 cycles
7.5 hrs
21:46✓ Recommended
6 cycles
9.0 hrs
20:16✓ Recommended
7 cycles
10.5 hrs
Other sleep calculators:
Was this result accurate?
How it works
This schlafrechner runs entirely in your browser — no data is sent to any server. Simply fill in the fields above and the result updates instantly. You can copy the output with the copy button provided.
Frequently Asked Questions
Wie lang ist ein Schlafzyklus?
Ein vollständiger Schlafzyklus dauert etwa 90 Minuten und umfasst Leicht-, Tief- und REM-Schlaf.