Sleep Better with SleepCalculator
Optimize your sleep schedule by calculating the best times to wake up or go to sleep based on your sleep cycles.
Sleep Calculator
Find your perfect sleep schedule
How It Works
A sleep cycle takes about 90 minutes. If your alarm goes off mid-cycle, you feel awful. If it goes off between cycles, you feel like a different person. This calculator figures out those between-cycle sweet spots.
Why Sleep Cycles Matter
Complete Cycles
Waking up at the end of a sleep cycle, rather than in the middle of one, helps you feel more refreshed and alert.
90-Minute Cycles
Each sleep cycle lasts about 90 minutes. During this time, you progress through different stages of sleep, from light to deep to REM.
Optimal Rest
For adults, completing 5-6 sleep cycles (7.5-9 hours) is ideal for optimal rest and cognitive function.
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