How and Why We Sleep

Sleep isn’t just our bodies going limp and dormant with our minds turned off; it is an alternate state of consciousness. We need it for growth, recuperation and enhanced mental function, but we still don’t fully know why we sleep.

This video explores this question along with how our brains function while we are asleep and what happens when we don’t sleep.

Sleep is defined as a ‘periodic, natural, reversible and near total loss of consciousness’. Current technology has given us a massive insight into studying this. Research has discovered four stages to sleeping, all being defined by their unique brainwave patterns. Different to being in a coma or hibernation, sleep is a state we enter into every night, and we certainly appreciate it every morning.

From Crash Course: Psychology on YouTube presented by Hank Green