noun
EXAMPLES FROM CORPUS
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Brain activity during REM sleep is significantly different from the brain activity experienced during stages two, three, and four.
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Cocaine use produces insomnia caused by a reduction in deep sleep and REM sleep .
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During REM sleep there is activity similar to what you would see in wakefulness.
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During REM sleep , they argued, the cortex is largely under the control of these random discharges from the hindbrain.
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During the early phases of the night, alcohol reduces REM sleep .
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Their REM sleep time was however reduced.
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They found that the effects on sleep were to increase the total amount of REM sleep and Stage 2 sleep.
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Well-established aspects of the early results relate to the behaviour of sleep mechanisms when REM sleep is prevented by repeated wakenings.