Sleep
Bedtime Calculator
Pick a wake time and we'll back-calculate bedtimes that land at the end of full sleep cycles.
What your result means
The earlier options give more total sleep. Pick the one that fits your real schedule.
How we calculate this
Wake time − 14 minutes − N × 90 minutes.
Limitations
Same cycle-length caveats as the sleep calculator apply. Treat the times as starting points.
Frequently asked questions
Related calculators
Related guides
References
- World Health Organization. https://www.who.int
- NHS — Health A to Z. https://www.nhs.uk
- Centers for Disease Control and Prevention. https://www.cdc.gov
Browse all calculators or read our evidence-based guides.