The claim that identification of periods of quiescence in upside down jellyfish (who lack anything approximating to a brain) proves that that organ is not essential for sleep is somewhat contentious (https://www.theguardian.com/science/2017/sep/21/caught-napping-snoozing-jellyfish-prove-a-brain-isnt-necessary-for-sleep). That only works as an explanation if you accept that the period of relative inactivity really equates with sleep in organisms with a more advanced central nervous system. It seems, to me, to be a rather large leap of faith.
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