Which animal doesn’t Sleep at all?

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Sleep is primarily a function of the brain. So it’s expected that without a brain that’s developed enough to actually Sleep, the animal won’t Sleep.

Example of some of the animals which seems to be doesn’t sleep at all:

  1. Cnidarians(Jellyfish, hydra, coral) never Sleep

2. Sponges, plants, bacteria and fungi also don’t Sleep

3. Arthropods like crustaceans, arachnids and insects don’t sleep as well but they undergo a metabolic                                slowdown state called as Torpor.

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