Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in muscle activity …

The meaning of SLEEP is the natural, easily reversible periodic state of many living things that is marked by the absence of wakefulness and by the loss of consciousness of one's …

At Sleep Therapy & Research Center (STRC), our mission is to restore health and vitality through better sleep. We are committed to diagnosing and treating sleep disorders with compassion, …

Drinking, drugs, sleeping around -- all with very little to no consequences. During the school week, she averages three to four hours of homework a night and six and a half hours of sleep.

A natural periodic state of rest for the mind and body, in which the eyes usually close and consciousness is completely or partially lost, so that there is a decrease in bodily movement …

Jul 27, 2025 · Sleep is not just the absence of wakefulness. It is not a passive shutdown. It is an active, dynamic, and vital process—a cycle of electrical storms, chemical symphonies, and …

the state of a person, animal, or plant that sleeps:[uncountable] Sleep wouldn't come, and he lay awake most of the night. a period of sleeping:[countable * usually singular] a good sleep.

Sleep is largely driven by the body’s internal clock, which takes cues from external elements such as sunlight and temperature. The body’s natural sleep-and-wake cycle is reasonably attuned to...

In humans and certain other animals, sleep occurs in five stages, the first four consisting of non-REM sleep and the last stage consisting of REM sleep. These stages constitute a sleep cycle …

When you sleep, you rest with your eyes closed and your mind and body inactive. During the car journey, the baby slept. [VERB] I've not been able to sleep for the last few nights. [VERB] ...a …