sleeping - the state of being asleep

nonrapid eye movement, nonrapid eye movement sleep, NREM, NREM sleep, orthodox sleep - a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time

paradoxical sleep, rapid eye movement, rapid eye movement sleep, REM, REM sleep - a recurring sleep state during which dreaming occurs; a state of Rapid Eye Movements during sleep

shuteye - informal term for sleep

physiological condition, physiological state - the state of the body or bodily functions

dormancy, quiescence, quiescency - a state of quiet (but possibly temporary) inaction; "the volcano erupted after centuries of dormancy"

rest - be at rest

practice bundling, bundle - sleep fully clothed in the same bed with one's betrothed

catch a wink, catnap, nap - take a siesta; "She naps everyday after lunch for an hour"

sleep in, sleep late - sleep later than usual or customary; "On Sundays, I sleep in"

hibernate, hole up - sleep during winter; "Bears must eat a lot of food before they hibernate in their caves"

aestivate, estivate - sleep during summer; "certain animals estivate"