ˈ ̷ ̷ ˌ ̷ ̷ - noun
: a state of deep usually dreamless sleep that occurs regularly during a normal period of sleep with intervening periods of REM sleep and that is characterized by delta waves and a low level of autonomic physiological activity
ˈ ̷ ̷ ˌ ̷ ̷ - noun
: a state of deep usually dreamless sleep that occurs regularly during a normal period of sleep with intervening periods of REM sleep and that is characterized by delta waves and a low level of autonomic physiological activity
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012