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. The adjacent entries separate circadian light timing, schedule consistency, caffeine kinetics, and the sleep-data anxiety 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.