Ultradian sleep cycle calculator and student cashflow manager.
Calculate ideal bedtimes based on parameterized 90m cycles and 14m latency.
If you close your eyes now, set alarms for these complete cycle endpoints:
Human sleep progresses through ~90-min cycles (NREM Stage 1, 2, Deep Slow-Wave 3, and REM). Waking at cycle boundaries avoids sleep inertia.
where n ∈ {3,4,5,6} cycles, C is cycle duration (~90m), L is sleep latency (~14m).