Answer :
Final answer:
Sleep is a periodic, reversible loss of consciousness with distinct stages. Narcolepsy involves daytime sleepiness and cataplexy, and circadian rhythms play a key role in regulating sleep.
Explanation:
Sleep is a loss of consciousness that is periodic, natural, and reversible, consisting of four distinct stages. Narcolepsy is a sleep disorder characterized by extreme daytime sleepiness and cataplexy. The interplay of circadian rhythms and homeostatic mechanisms regulates sleep patterns.
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