Season 47: Episode 3

Season 47: Episode 5

Nova (1974)

Season 47: Episode 4

Mysteries of Sleep

TMDb

Air Date:

2025-12-06

Genre

Documentary

Release Date

1974

End Date

2025

Episode Description

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.

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