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Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity.
Young woman asleep over study materials. The relationship between sleep and memory has been studied since at least the early 19th century.Memory, the cognitive process of storing and retrieving past experiences, learning and recognition, [1] is a product of brain plasticity, the structural changes within synapses that create associations between stimuli.
Sleep is a highly conserved behavior across animal evolution, [6] likely going back hundreds of millions of years, [7] and originating as a means for the brain to cleanse itself of waste products. [8] In a major breakthrough, researchers have found that this cleansing may be a core purpose of sleep. [9]
Known as slow-wave sleep or stage 3 non-REM sleep, this is the deepest stage of sleep and the hardest to wake up from. Brain activity slows down, muscles and bones strengthen, hormones regulate ...
After going through stages of REM-sleep, people with depression report feeling better, in a study done by Cartwright et al. [40] Conversely, a theory proposed by Revonsuo [41] states that when people experience negative emotions or negative events, when they sleep the REM-sleep replays such events, which is known as rehearsal. [39]
The National Sleep Foundation says that stress, depression, daytime drowsiness, alcohol, and fever can also cause somniloquy. Experts advise sleep talkers to reduce their anxiety and develop ...
Within a few months of postnatal development, there is a marked reduction in percentage of hours spent in REM sleep. By the time the child becomes an adult, he spends about 6–7 hours in NREM sleep and only about an hour in REM sleep. [46] [47] This is true not only of humans, but of many animals dependent on their parents for food. [48]
Getting paid to sleep -- you might say it's a dream come true. The truth is, hospitals will pay you to sleep -- or not sleep, in some cases -- so they can learn more about sleep and sleep-related