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Learn about sleep, a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. Find out how sleep is divided into two broad types: non-REM and REM sleep, and how they differ in brain waves, dreams, and physiological changes.
Learn about the functions, benefits and stages of sleep, and how much sleep you need at different ages. Find out how to improve your sleep quality and what to do if you have sleep problems or disorders.
Learn how much sleep you need based on your age and the benefits of sleep for your health. Find out the signs of sleep deprivation and the stages of sleep, from light to deep to REM.
1. Stick to a sleep schedule Set aside no more than eight hours for sleep. The recommended amount of sleep for a healthy adult is at least seven hours. Most people don't need more than eight hours in bed to be well rested. Go to bed and get up at the same time every day, including weekends. Being consistent reinforces your body's sleep-wake cycle.
We tend to think of sleep as a time when the mind and body shut down. However, sleep involves many important and necessary processes.
About Sleep Key points Good sleep is essential for our health and emotional well-being. Getting enough sleep and good sleep quality are essential for healthy sleep. The amount of sleep you need changes as you age. Talk to your healthcare provider if you have problems sleeping.
Sleep deprivation doesn't just make you tired — it can raise blood pressure, disrupt hormones, impair mental health, and weaken your immune system. Learn the risks and symptoms of not getting enough sleep.
Learn how sleep affects your brain and body, and what happens in the brain during different stages of sleep. Find out how sleep is regulated by biological mechanisms and how lack of sleep can impact your health.
Learn about the different types of sleep, the genes and processes that regulate sleep, and the health benefits and risks of sleep. Johns Hopkins sleep expert Mark Wu, M.D., Ph.D., explains the latest research on the science of sleep.
Sleep supports healthy brain function, physical health, and growth and development. Learn how sleep affects your heart, metabolism, respiratory and immune systems, and thinking and memory.