NOVA - Season 47 Episode 4
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.
First Air Date : 1974-03-03
Last Air date : 2024-11-27
Runtime : 57 minutes
Genre : Documentary
Cast :
Crew :
Quality : 
Subtitles :
- Season 47 : Episode 12020-02-05
- Season 47 : Episode 22020-02-12
- Season 47 : Episode 32020-02-19
- Season 47 : Episode 42020-02-26
- Season 47 : Episode 52020-04-01
- Season 47 : Episode 62020-04-08
- Season 47 : Episode 72020-05-13
- Season 47 : Episode 82020-05-20
- Season 47 : Episode 92020-09-09
- Season 47 : Episode 102020-09-16
- Season 47 : Episode 112020-09-23
- Season 47 : Episode 122020-09-30
- Season 47 : Episode 132020-10-14
- Season 47 : Episode 142020-10-21
- Season 47 : Episode 152020-10-28
- Season 47 : Episode 162020-11-25
