Sleep is a natural state of bodily rest observed throughout the animal kingdom. It is common to all mammals and birds, and is also seen in many reptiles, amphibians and fish.

Read about how to get a healthy nights sleep, how much sleep is enough, and why skimping on sleep can lead to poor performance, health, and moods.

A sleep disorder (somnipathy) is a medical disorder of the sleep patterns of a person or animal. Some sleep disorders are serious enough to interfere with normal physical, mental ...

Eliminate Sleep Problems Breakthrough System To Fall Asleep Read My Story To Find Out More Sleep.SleepingStory.com

noun . 1. the condition of being asleep. ?adjective . 2. asleep. 3. of, pertaining to, or having accommodations for sleeping: a sleeping compartment.