1. (noun) 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

• nonrapid eye movement
• nonrapid eye movement sleep
• nrem
• orthodox sleep

1. (noun) 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

• sleep
• slumber