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Sleep - Wikipedia

Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep, and reduced interactions with surroundings..

Brain Basics: Understanding Sleep | National Institute of ...

Sleep is important to a number of brain functions, including how nerve cells (neurons) communicate with each other. In fact, your brain and body stay remarkably active while you sleep. Recent findings suggest that sleep plays a housekeeping role that removes toxins in your brain that build up while you are awake..

Sleep | Definition of Sleep by Merriam-Webster

Sleep definition is - the natural, easily reversible periodic state of many living things that is marked by the absence of wakefulness and by the loss of consciousness of one's surroundings, is accompanied by a typical body posture (such as lying down with the eyes closed), the occurrence of dreaming, and changes in brain activity and physiological functioning, is made up of cycles of non-REM ....

Sleep Disorders, Deprivation, Disturbance & How to Fall ...

Sleep is influenced by the circadian rhythms (regular body changes in mental and physical characteristics that occur in the course of about 24 hours). These are controlled by brain neurons that respond to light, temperature and hormones and other signals and comprise the body's biological clock..

Why Do We Sleep? What Happens During Sleep?

The brain plasticity theory says sleep is required for brain function. Specifically, it allows your neurons, or nerve cells, to reorganize. When you sleep, your brain’s glymphatic (waste clearance)....

Sleep Disorders Center: Types of Sleep Disorders, Symptoms ...

Good sleep is necessary for optimal health and can affect hormone levels, mood and weight. Sleep problems, including snoring, sleep apnea, insomnia, sleep deprivation, and restless legs syndrome,....