NOVA

Season 47 Episode 4: Mysteries of Sleep

From fruit flies to whales, virtually every animal sleeps. But why? Why do we need to spend nearly a third of our lives in such a defenseless state? Scientists are peering more deeply into the sleeping brain than ever before, discovering just how powerful sleep can be, playing a role in everything from memory retention and emotional regulation to removing waste from our brains.

Genre:

Documentary

Seasons:

53

Episodes:

1020

Quality:

HD

Status:

Returning Series

First Air:

1974

IMDb:

7.0