title: Sleep and sleep mechanisms.
mesh_terms: D000367:Age Factors; D001794:Blood Pressure; D006801:Humans; D009638:Norepinephrine; D012119:Respiration; D012701:Serotonin; D012890:Sleep / Q000145:classification; D012894:Sleep Stages; D012895:Sleep, REM
chemical_list: D012701:Serotonin; D009638:Norepinephrine