Do crabs sleep upside down

Answer 1

A crab has evolved to move sideways in response to its environment. Its body is relatively flat with eyes that face forwards on stalks. It lives in rock crevices and moves sideways across the surfaces of coral, etc with its back against the rock face, therefore always facing outwards to possible threats from predators, other crabs, etc. When danger appears it can easily conceal itself in gaps between rocks for protection where necessary. I have seen crabs do this on many occasions as a Scuba diver and this explanation seems very reasonable to me.

Answer 2

yes fish do sleep upside down and if they are dead then they are on their side

Answer 3

some do and some don't it depends on what kind of crab it is.

Answer 4

yea the do apperantly