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  1. Sleep - Wikipedia

    Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in muscle activity and …

  2. Sleep: What It Is, Why It’s Important, Stages, REM & NREM

    Sleep is a body process that allows your body to rest, repair and restore itself. You need sleep to function properly. Lack of sleep has links to many health issues.

  3. Why Do We Need Sleep?

    Jul 10, 2025 · Everyone needs sleep, but about one in three American adults don’t get enough of it. The consequences of sleep deprivation are serious, so it’s worth learning why sleep matters, how it …

  4. About Sleep | Sleep | CDC

    Quality sleep means you are getting uninterrupted and refreshing sleep. Getting quality sleep is not just about how many hours you sleep, but how well you sleep.

  5. Brain Basics: Understanding Sleep - National Institute of Neurological ...

    Feb 25, 2025 · Sleep is a complex and dynamic process that affects how you function in ways scientists are now beginning to understand. This webpage describes how your need for sleep is regulated and …

  6. What happens during sleep - and how to improve it - Harvard Health

    Jun 1, 2025 · Sleep affects nearly every part of your health, from brain function to immune strength. Learn what happens in each phase of sleep, how to manage common disruptions, and simple ways …

  7. Healthy Sleep - MedlinePlus

    Dec 9, 2025 · Sleep is a natural process that helps your body restore energy, supports learning and memory, and keeps you healthy. During sleep, your brain cycles through different stages of non …

  8. The Science of Sleep: Understanding What Happens When You Sleep

    What exactly does sleep do for your body and mind? Here’s what researchers know about the science of sleep—including the stages of sleep, your biological clock, health connections and more.

  9. Sleep Evaluation | Corewell Health

    Our team starts by evaluating your sleep issues, then creates a personalized plan for you through a collaboration with top specialists, including pulmonologists, cardiologists, neurologists, and sleep …

  10. How Much Sleep Do You Need by Age? - MedicineNet

    Dec 5, 2025 · The amount of sleep you need varies depending on your age, gender, and other factors. Here's a breakdown of sleep requirements by age.