The Importance of Sleep
During sleep we (1) are completely vulnerable to predators; (2) cannot hunt for food; (3) cannot hunt for a mate or reproduce; and (4) cannot care for or protect our young. For evolution to not have eliminated sleep on this basis means that it must be incredibly important.
Sleep may relate to risk of Alzheimer’s disease.
Wakefulness produces low-level oxidative damage, and sleep is the price we pay for wakefulness. Sleep repairs much of the oxidative damage, and insufficient sleep can lead to neuronal death by insufficient repair time.