Sleep and Circadian Health

Sleep stages, sleep architecture, circadian-rhythm interventions, and chronotype-sensitive protocols. The single biggest healthspan lever the field still under-treats.

Start with Sleep Architecture: the map of N1, N2, N3, REM, sleep cycles, fragmentation, and why total sleep time is necessary but incomplete. Then use Circadian Light Hygiene for the bright-day, dim-evening timing signal that lets the night unfold. Sleep Consistency keeps that signal attached to a repeatable schedule, while Caffeine Half-Life and Adenosine separates stimulant kinetics from bedtime willpower. Sleep Tracking Anxiety names the failure mode that appears when stage estimates become nightly verdicts.

Read straight through, or land on a specific entry and follow its outgoing links into the rest of the book.