How Do Animals Sleep Underwater?

Sleep is necessary four 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

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