Sleep Cycle Pattern Calculator

What is Sleep Inertia?

Human sleep fundamentally does not function as a cohesive linear solid block. Instead, mammalian sleep operates through precisely stacked 90-minute chronological phases known universally as cycles (oscillating from light stages, descending into deep tissue repair, rising slightly into Rapid Eye Movement (REM), and floating back upward).

If a standard morning alarm arbitrarily forces you awake deep directly inside stage 3 or 4 wave phases, you undergo brutal neurological shock recognized clinically as Sleep Inertia—resulting in crushing lethargy regardless of aggregate total sleep hours accrued.

How Cycles are Computed

This algorithm strictly isolates 90-minute boundaries running sequentially, additionally baking in a static constant coefficient of ~14-16 average minutes predicting the physiological latency window needed practically to naturally transition from wakefulness to actual baseline Phase 1.