Studying sleep in reptiles, amphibians and fish or in invertebrates (e.g., worms and insects) brings us face to face with the problem of how we define sleep. Sleep's presence has traditionally been judged by certain behavioral criteria: 1) minimal movement 2) a typical sleep posture (e.g., for humans, lying down; for bats, hanging upside down) 3) reduced responsiveness to external stimulation 4) quick reversibility of reduced responsiveness with relatively intense stimulation (which distinguishes sleep from other states like death, anesthesia, and coma). On the basis of these criteria, we can conclude that "sleep" is present throughout the animal kingdom. It has been identified in bees, wasps, flies, dragon flies, grasshoppers, butterflies alligators, turtles, lizards, frogs, salamanders, and scorpions. We cannot yet conclude, however, that sleep in invertebrates reflects the same physiological processes and fulfills the same functional goals as the sleep of mammals and birds. Because mammals and birds have similar EEG, EOG and EMG activity when they sleep, we have some confidence that their similar sleep behaviors are produced by similar physiological processes. However, animals with more primitive nervous systems do not have the brain structures which can generate the same electrophysiological patterns of brain activity that we use to define sleep in mammals, so the analogy to mammalian and avian sleep is uncertain and we do not know if they "sleep", as we define the word. In addition, because we are not certain what the function of sleep is in invertebrates, mammals, birds, and other species, we cannot be sure that sleep serves the same function in all animals. Perhaps this is why there are so many different theories of sleep

...THOSE BASTARDS NEED TO TAKE AN ETERNAL SLEEP!!!...muahahahahaha

I believe they do at night...but I'm not sure. One thing for sure though, they like to nest in my fire pit for some reason...I send them to sleep forever with a tank of gas and a match.