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REM sleep a recurrent phase of sleep, characterized by rapid side-to-side eye movement, dreaming, and inhibition of muscle movement.
sleep mode a power-saving mode of operation to which a computer or other machine reverts when idle, in which power to the display and to other nonessential parts of operation is deactivated.
sleep over to stay through the night at the home of a friend or relative.
sleep tight to sleep well or soundly.
sleep-away of or pertaining to a place, especially a recreational camp for children, where one stays overnight, usually for several days.