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.

Sleep deprivation is a general lack of the necessary amount of sleep. This may occur as a result of sleep disorders, active choice or deliberate inducement such as in interrogation ...

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.

On-line web source for abstracts of articles published in SLEEP, the official journal of the American Sleep Disorders Association (www.asda.org) and the Sleep Research Society ...

USA. Non-profit trade organization for the global mattress and related industries. Calendar of events and supplies guide. Link to monthly journal.