CALCULATOR · FREE免费 · Free
Sleep Cycle Calculator
Sleep runs in cycles of roughly 90 minutes. Enter your wake time and how long it takes to fall asleep to see bedtimes for four, five or six cycles; this is an estimate, not medical advice.
--4 cycles ·
--5 cycles ·
--6 cycles ·
--5-cycle sleep · min
Estimates only; verify on site before ordering or building.
Example
| Item | Value | Unit |
|---|---|---|
| Wake hour | 7 | h |
| Wake minute | 0 | min |
| Sleep latency | 15 | min |
| 4 cycles | 00:45 | |
| 5 cycles | 23:15 | |
| 6 cycles | 21:45 | |
| 5-cycle sleep | 450 | min |
Where people go wrong
- Adding latency to wake time instead of subtracting it.
- Assuming every person has exactly 90-minute cycles.
- Treating the result as a medical diagnosis.
FAQ
Are 90-minute cycles exact?
It is an average; cycles vary by person and night. A sleep log is more reliable.
Should I choose 4, 5 or 6 cycles?
Choose by your sleep need; most adults need 7 to 9 hours, roughly five to six cycles.
Is this medical advice?
No; see a clinician for persistent insomnia, snoring or daytime sleepiness.