title: Temporal organization of human sleep: general trends of sleep stages and their ultradian cyclic components.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008433:Mathematics; D008722:Methods; D012737:Sex Factors; D012890:Sleep / Q000502:physiology; D012894:Sleep Stages / Q000502:physiology*; D012895:Sleep, REM; D013997:Time Factors