Sleep Time Calculator
Find ideal bedtimes or wake times from natural 90-minute sleep cycles and sleep latency.
Hit Calculate to see your cycle zone
Options appear after calculation
Metrics appear after calculation
Your explanation appears here
Sleep stages vary night to night. Use these times as gentle planning targets rather than medical rules.
Your plan appears after calculation
Test a different sleep latency and cycle count without changing your main result.
Calculate your baseline first
It counts backward or forward in 90-minute sleep cycles, then adds your selected fall-asleep buffer so the recommended time reflects when you get into bed.
Five cycles is about 7.5 hours asleep and six cycles is about 9 hours, which fits the common adult sleep target range better than shorter nights.
No. Treat the result as a planning guide. Real sleep depends on stress, caffeine, light, health, schedule consistency and individual sleep architecture.
Results are estimates generated locally in your browser from simplified 90-minute sleep-cycle math. They are for informational purposes only, not medical advice or a diagnosis. Persistent insomnia, excessive daytime sleepiness, loud snoring, breathing pauses, shift-work sleep problems, or health concerns should be discussed with a qualified healthcare professional. VisionVix accepts no liability for decisions based on this output.