Word, Definition, Sleep, A natural state of rest with reduced awareness., Circadian rhythm, A biological rhythm lasting about 24 hours., Ultradian rhythm, A biological rhythm shorter than 24 hours., REM sleep, A sleep stage linked to dreaming., NREM sleep, Sleep stages without rapid eye movements., SCN, A brain structure that controls the body clock., Melatonin, A hormone that makes you feel sleepy., Bio rhythm, A natural repeating pattern in the body..

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