We need good sleep so that we can function well — both mentally and physically — during our waking hours. Good sleep can enable us to work productively, make sound judgments, avoid harm, and interact with other people effectively.
Sleep also helps us in less visible ways. During sleep, the body secretes a hormone that repairs and regenerates tissue throughout the body. Sleep may also be instrumental in reinforcing our memories and, some experts believe, essential to processing complex emotions.
