Sleep Cycle CalculatorWake up feeling refreshed between sleep cycles.Desired Wake TimeCalculate Ideal Bedtime🌙Optimal Bedtimes (90-min Sleep Cycles)To wake up feeling refreshed between sleep cycles:5 cycles (7h30 of sleep - Recommended)23:156 cycles (9h00 of sleep)21:454 cycles (6h00 of sleep)00:45Emplacement publicitaire