Aserinsky-Kleitman 1953 REM discovery; Rechtschaffen-Kales 1968 → AASM 2007 staging: NREM (N1/N2/N3 deep slow-wave) + REM cycle ~90 min through night. N1 (theta), N2 (sleep-spindles + K-complexes), N3 (delta SWA), REM (mixed-frequency,…
Aserinsky-Kleitman 1953 REM discovery; Rechtschaffen-Kales 1968 → AASM 2007 staging: NREM (N1/N2/N3 deep slow-wave) + REM cycle ~90 min through night. N1 (theta), N2 (sleep-spindles + K-complexes), N3 (delta SWA), REM (mixed-frequency,…