It should be known I am trying to sleep right now, sitting down, with no success:)
In: Biology
Some animals can basically lock their joints into place and happily stay like that without having to put in the effort to activate their muscles. They have other parts like special tendons or ligaments to support them. This can be advantageous if you’re a delicious looking prey that needs to be able to run asap when you notice a predator. However, they can’t enter deep REM sleep during this so they can’t do that all the time. They do need to lie down and sleep from time to time.
There may be some exceptions I’m not aware of
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