Sleep is a kind of temporary coma.
During which stage of sleep does body temperature begin to fall?
The group that needs the most sleep during a 24-hour cycle is __________.
Sleep may have some ability to help the brain rewire itself.
Sleep is a biological function.
Most land mammals have the ability to rest one hemisphere of their brains at a time.
Sleep could be best described as a __________.
Which of the following most accurately describes the brain during sleep?
As the sleep cycles continue, the proportion of REM sleep in each cycle decreases.
Some psychologists suggest that sleep has evolved in order to allow humans to dream.
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