The rhythm of sleep.
D000328:Adult; D000367:Age Factors; D000368:Aged; D001683:Biological Clocks; D005260:Female; D005750:Gastric Juice / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D010347:Patient Care Planning; D012737:Sex Factors; D012892:Sleep Deprivation; D012894:Sleep Stages / Q000502:physiology*; D012895:Sleep, REM / Q000187:drug effects / Q000502:physiology; D013256:Steroids / Q000502:physiology; D013315:Stress, Psychological / Q000503:physiopathology
D013256:Steroids