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Calculate Optimal Sleep Time
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Recommended Bedtimes
Includes 15 minutes to fall asleep. Waking up between cycles helps you feel more refreshed!
Optimize Your Deep Sleep Schedule
Every sleep cycle lasts about 90 minutes. Waking at the end of one feels very different from waking in the middle of deep sleep, which is what causes that heavy, foggy feeling even after eight hours in bed.
Enter a wake-up time above and the calculator counts backwards through 4 to 6 complete cycles. Use it for a fixed alarm, a shift pattern, or simply to find the bedtime that leaves you refreshed rather than groggy. It is free, needs no account, and works for any age.
Benefits of Quality Sleep
- ✨ Enhanced memory consolidation
- 💪 Stronger immune system
- 😊 Better mood regulation
- 🚀 Increased productivity
- 🧠 Improved cognitive function
Consequences of Sleep Deprivation
- 😵 Weakened immunity
- 🤯 Impaired cognition
- 😰 Mood disorders
- 🏥 Chronic disease risk
- 😴 Reduced reaction time
Sleep Cycle Science
90 min
Sleep Cycle Duration
5-6
Ideal Cycles per Night
15 min
Average Time to Fall Asleep