Some psychologists suggest that sleep has evolved in order to allow humans to dream.
Which of the following most accurately describes the brain during sleep?
Sleep stages are defined in terms of the __________.
Sleep stages are defined in terms of the __________.
The brain remains active during sleep.
According to the energy conservation theory of sleep, sleep is an adaptive behavior because sleep __________.
As the sleep cycles continue, the proportion of REM sleep in each cycle decreases.
The group that needs the most sleep during a 24-hour cycle is __________.
Sleep is a kind of temporary coma.
During which stage of sleep does body temperature begin to fall?
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