Scientists discover the first brainless animal that sleeps
In my humble opinion every animal consistent of multiple cells alive on this planet developed sleep for just one reason: the very same reason plants sleep. Our planet has a night phase and without sun little energy is left. So as a consequence the best one can do is to clean up internal processes or go into some sort of energy saving mode. Ofc this is heretic to some individuals...<p>But Ockham's razor tells me I'm right.