Health & Fitness
Sleep Cycle Calculator
Suggested bedtimes ~90 min cycles before wake.
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: Sleep Cycle Calculator
What it does
Suggests bedtimes or wake times spaced by approximate sleep cycles.
How to use it
Enter wake time or bedtime and cycle count to see suggested times.
Formula
Cycle length ≈ 90 minutes; sleep duration ≈ n × 90 minutes.
Example
If you need to wake at 6:30 AM, counting back 5 cycles (~7.5 h) suggests a bedtime near 11:00 PM.
FAQs
Is 90 minutes exact for everyone?
No. Cycle length varies; this is a rough guide.
Why add sleep latency?
Falling asleep takes time; consider 15–20 minutes buffer.
I have insomnia—should I follow this?
See a clinician for persistent sleep problems; this tool is not treatment.