Does alcohol disrupt sleep?
Yes. Alcohol speeds sleep onset but fragments the second half of the night, suppresses REM, and increases nighttime wake-ups. Even moderate amounts measurably degrade sleep quality.
The two halves
Alcohol acts as a sedative for the first 3–4 hours of sleep. As it metabolizes, the body enters mild withdrawal, causing more arousals and lighter sleep in the second half.
REM suppression
Alcohol suppresses REM in the first half of the night, then triggers REM rebound (vivid dreams, fragmented REM) in the second half. Long-term, this disrupts memory consolidation.
Practical rule
No alcohol within 3 hours of bed. Even one drink within that window measurably reduces deep sleep.
Sources
- Matthew Walker, Why We Sleep (Scribner, 2017). Why We Sleep: Unlocking the Power of Sleep and Dreams
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