Sleep Has Architecture
Statement
Sleep cycles through distinct stages (N1, N2, N3/SWS, REM)
with different functions
Why it matters
Not all sleep is equal --- timing and continuity
affect which stages you get
Why Foundational
Foundational because the four-stage cycle structure (N1, N2, N3/SWS, REM) is undisputed across decades of polysomnography. Each stage’s distinct neurochemistry (acetylcholine surge in REM, slow oscillations in SWS) and function (memory consolidation, glymphatic clearance, emotional processing) is independently confirmed. Not all sleep is equal — timing and continuity determine which stages you actually get.