How Your Brain Works While You Sleep | Better | NBC News

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In this step you'll learn about the five stages of sleep and how the world affects our brains and ourselves. The five stages of sleep are Alpha and Theta waves associated with peacefulness, Sleep Spindles, Delta waves, and Rapid Eye Movement. During each of these stages, the brain is processing memories, consolidating information, and storing important items in long-term memory. It is important to get adequate sleep to ensure cognitive and attention functions are working well.