“Sleep is one of our basic functions, and it is important because being awake is very energy-consuming, and it's very stressful,” says Sara Mednick, Ph.D., a [professor of cognitive science] at the Mednick Sleep and Cognition Lab at the University of California, Irvine. “Sleep helps us learn what we've experienced during the daytime, keep the ideas that we want and let go of a lot of information that we don't need, and then make connections between our new experiences and what we know about the world.”

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