21:45
6 cycles · 9h 00m
Calculate suggested bedtimes or wake times using 90-minute sleep cycles and optional fall-asleep time.
21:45
6 cycles · 9h 00m
23:15
5 cycles · 7h 30m
00:45
4 cycles · 6h 00m
02:15
3 cycles · 4h 30m
Adults often choose 5–6 cycles. Actual sleep cycles vary by person.
Calculate suggested bedtimes or wake times using 90-minute sleep cycles and optional fall-asleep time.
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Health use notice
This tool is for general reference only and does not replace medical, nutrition, diagnostic, or treatment advice. For health decisions, confirm the result with a clinician, registered specialist, or official guidance.
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