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• Sleep - Wikipedia, the free encyclopedia

  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 disorder - Wikipedia, the free encyclopedia

  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 ...

• Guide to Healthy Sleep on MedicineNet.com

  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.