sleep deprived  - term used to describe a person who doesn't get enough sleep, short sleepers - people who can function well on less sleep than other people, sleep deficit - condition that occurs when people frequently get less sleep than they should, circadian rhythms - naturally occurring physical, behavioral, and mental changes in the body, sleep-wake-cycle - pattern of sleeping in a 24-hour period (16 hours awake, 8 hours alseep), melatonin - hormone that increases feelings of relaxation and sleepiness and signals that it is time to go to sleep, jet lag - fatigue that people feel after changing time zones when they travel, REM sleep - active stage of sleep during which your breathing changes, your heart rate and blood pressure rise, and your eyes dart around rapidly,

3.1 SLEEP

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