Sleep Cycle Calculator
Choose wake-up time or bedtime and get cycle-friendly windows instantly, including your fall-asleep buffer.
Frequently asked questions
A sleep cycle is one full progression through sleep stages, including light sleep, deep sleep, and REM sleep.
Many people average about 90 minutes per cycle, but individual variation is normal.
The best bedtime is one that fits your wake-up time and allows enough full sleep cycles consistently.
You may be waking during deep sleep, sleeping too little, or dealing with inconsistent routines.
Most adults need around 7 to 9 hours each night, though personal needs vary.
Yes, you can test shorter windows. For naps, many people use one cycle or a shorter controlled nap.
No. The calculator is educational and informational only, not a medical diagnosis or treatment tool.