Citat:
Alcohol shortens the time it takes to fall asleep, it reduces REM sleep (which, research shows, stimulates regions of the brain necessary for learning and good cognitive function), and it increases non-REM sleep, which is a lighter slumber. As the alcohol begins to withdraw from your body later in the night, sleep becomes more shallow and disrupted, REM sleep increases (all at once, rather than slowly, over the course of the night), and with it, so do dreams and/or nightmares. This all adds up to a poor night's rest.