Sleep Cycle Calculator
Calculate bedtimes and wake times aligned to 90-minute sleep cycles.
Find optimal wake-up times by sleep cycles.
How to use
- Enter either your desired wake-up time or bedtime.
- View suggested times based on 90-minute sleep cycles.
- Pick a time that allows full cycles plus fall-asleep buffer.
- Use the suggestions to plan a more refreshing sleep schedule.
About Sleep Cycle Calculator
Find optimal wake-up times by sleep cycles.
Runs in your browser — your files and input stay on your device.
Frequently asked questions
Are sleep cycles exactly 90 minutes?
Cycles vary by person. Ninety minutes is a useful average for planning.
Is this medical advice?
No. Consult a sleep specialist for sleep disorders.
Is data stored?
No.