Alcohol is the world's most common self-prescribed sleep aid and one of the most misunderstood. It shortens the time it takes to fall asleep, then systematically degrades the second half of the night — which is why heavy drinkers often wake around 3 AM and feel tired after eight hours in bed.
First hours: deeper N3, faster onset. Later hours: REM suppression, REM rebound with vivid dreams, fragmented deep sleep, elevated heart rate, and worsened breathing. Even one drink measurably raises overnight resting heart rate.
One drink three hours before bed is very different from two drinks at 10 PM. The practical rule most clinicians converge on: no alcohol within three hours of bedtime, cap at one or two drinks, and pair each with water.
Alcohol makes falling asleep easy, so it feels like a solution. Sleep quality degrades, next-day tiredness increases, anxiety about sleep rises, reliance grows. The nightcap you use to escape insomnia often causes it.
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