Anthropology Entry 2

Sleep among humans is universal, every nation, every religion, every race, and every tradition incorporates sleep. However, some cultures differ from when and how long they sleep. For instance, people in western developed culture usually sleep monophasically, one continuous portion of sleep with no breaks. However in some parts of the world like Tibet, polyphasic sleep is practiced in which they sleep multiple times throughout the day in short breaks. The same can be said for our prehistoric ancestors who also broke up sleep in to two or more chunks, waking up to be aware of possible danger in the night then returning to sleep.