Sleep Cycle Calculator

Sleep Timing Estimate

Sleep cycle timing uses 90-minute cycles and a fall-asleep delay to estimate convenient bedtimes or wake times.

Formula: target time +/- sleep cycles x 90 minutes +/- fall-asleep time.

Understanding Sleep Cycles

1. What This Calculator Measures

Sleep cycle timing estimates bedtimes or wake-up times using common 90-minute sleep cycles.

2. How the Calculation Works

The calculator adds or subtracts cycle blocks and includes an estimated fall-asleep delay.

3. Formula or Rule Used

target time = base time +/- cycle count x 90 minutes +/- fall-asleep minutes.

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