According to Wikipedia, the worm C. elegans is the most primitive animal that sleeps. This might, of course, depend on your definition of sleep.
In experiments to learn more about invertebrate sleep, scientists apparently compared the actions of regular fruit flies to sleep-deprived fruit flies. I'm guessing that means that it was some scientist's job to keep flies from falling asleep.
You can tell a cockroach is asleep when its antennae are "folded down."
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