Why do we need SLEEP?

The urge to sleep is all-consuming, and is equally as important as food to keep us alive. Sleep is common to mammals, birds and reptiles, and has been conserved through evolution, even though it prevents us from performing tasks such as eating, reproducing and raising young.

There have been many theories about why we sleep, from a way to rest after the day’s activities or a method for saving energy, to simply a way to fill time until we can be doing something useful, but all these ideas are flawed. The body repairs itself just as well when we sit quietly, we only save around 100 calories a night by sleeping, and we wouldn’t need to catch up on sleep during