stofje in je hersens wanneer je erg moe bent...

A 2002 University of California animal study indicated that REM sleep was necessary for turning off neurotransmitters and allowing their receptors to "rest" and regain sensitivity which allows monoamines (norepinephrine, serotonin and histamine) to be effective at naturally produced levels. This leads to improved regulation of mood and increased learning ability. The study also found that REM sleep deprivation may alleviate clinical depression because it mimics selective serotonin reuptake inhibitors (SSRI).

This is because the natural decrease in monoamines during REM is not allowed to occur, which causes the concentration of neurotransmitters in the brain, that are depleted in clinically depressed persons, to increase. 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.[15]

Animal studies suggest that sleep deprivation increases stress hormones, which may reduce new cell production in adult brains.[16]

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