Uploaded January 2026 | Updated September 2026, 3 weeks ago

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Sleep is necessary for our brains. Without it we wouldn't last long. So how do animals that spend their lives underwater manage to sleep without drowning or being eaten?

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00:00 How Do Animals Sleep Underwater?
01:36 REM vs Non-REM sleep
02:32 Why sleep is essential for life
02:46 Cetaceans - Half-brain sleep
05:58 Pinnipeds - hybrid sleep
08:03 How marine mammals differ from humans
09:52 How scientists study fish sleep
11:12 How fish protect themselves while sleeping
12:22 Strange fish sleeping positions
13:01 How sharks sleep
14:38 Invertebrate sleep (octopus & jellyfish)
16:04 Sleep in brainless animals (jellyfish)

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Examining the nature of the beast.

#fish #animals #sleep #ocean #wildlife #nature #documentary