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Some electrophysiological studies have shown that neuronal activity patterns found during a learning task before sleep are reactivated in the brain during sleep. [86] This, along with the coincidence of active areas with areas responsible for memory have led to the theory that sleep might have some memory consolidation functions.
Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
A sleep study is a test that records the activity of the body during sleep. There are five main types of sleep studies that use different methods to test for different sleep characteristics and disorders. These include simple sleep studies, polysomnography, multiple sleep latency tests (MSLTs), maintenance of wakefulness tests (MWTs), and home ...
A new study in mice suggests the hypothesis that brain-cleansing occurs during sleep may be inaccurate. The findings show that mice cleaned more toxins and metabolites from the brain when they ...
The Multiple Sleep Latency Test (MSLT) measures a person's physiological tendency to fall asleep during a quiet period in terms of sleep latency, the amount of time it takes for someone. An MSLT is normally performed after a nocturnal polysomnography to ensure both an adequate duration of sleep and to exclude other sleep disorders.
The Wisconsin Sleep Cohort Study, a longitudinal study of the natural history of obstructive sleep apnea (OSA), found that of a random sample (602 employed men and women, 30–60 years old) the prevalence of OSA (5 or more events/hr) was 9% for women and 24% for men. However, the study found that among sleepy patients in this group, 2% of women ...
Sleep may facilitate the synthesis of molecules that help repair and protect the brain from metabolic end products generated during waking. [96] Anabolic hormones, such as growth hormones, are secreted preferentially during sleep. The brain concentration of glycogen increases during sleep, and is depleted through metabolism during wakefulness. [97]
Sleep outside of the REM phase may allow enzymes to repair brain cell damage caused by free radicals. High metabolic activity while awake damages the enzymes themselves, preventing efficient repair. This study observed the first evidence of brain damage in rats as a direct result of sleep deprivation. [42]