The disconnect between the need for sleep and the possession of a brain is what prompted Dragana Rogulja, an assistant professor of neurobiology in the Blavatnik Institute at Harvard Medical School, and her team to take a look at multiple tissues in sleep-deprived flies and mice.

From memory formation to waste clearance, sleep, Dragana Rogulja said, is thought of as “of the brain, by the brain, for the brain.” However, sleep may be necessary for the brain, but the brain is not necessary for sleep.