Can't sleep after alcohol? Here is why

What alcohol does to the night

Alcohol is a sedative, so the first part of the night can feel heavy and deep. A 2013 review in Alcoholism: Clinical and Experimental Research by Ebrahim and colleagues pulled together decades of laboratory studies. At most doses, alcohol shortened the time it took to fall asleep and deepened the first half of the night, while the second half showed more disruption and less dream sleep at higher doses.

As your body breaks down the alcohol, the sedating effect wears off and a rebound in alertness follows. Add a full bladder, dehydration, warmth and sometimes snoring, and early-morning waking becomes very likely.

If you wake up at 3 AM after drinking

1. Drink a glass of water and use the bathroom with as little light as possible. A dim night light beats the overhead light.
2. Get comfortable and cool. Alcohol can make you warm and sweaty. Kick off a layer of bedding.
3. Do not check your phone. Messages from the evening are the last thing you need to reread at 3 AM.
4. Slow your breathing. A few rounds of box breathing are easy to follow when you feel foggy.
5. Use a neutral image. If your mind starts replaying the night, switch to something boring and visual, as in what to think about to fall asleep.

If you are still wide awake after what feels like a long time, get up for a few minutes in low light and go back when you feel drowsy.

Drinking in a way that protects your sleep

• Stop earlier. Finishing your last drink a few hours before bed gives your body time to process much of it before you lie down.
• Alternate with water. It slows your pace and reduces dehydration.
• Eat with alcohol. Food slows absorption.
• Skip the nightcap. A drink used as a sleep aid tends to backfire in the second half of the night.

A drink with dinner affects sleep less than several drinks late in the evening, but sensitive sleepers may notice even one.

Pay attention to the morning after, too. A heavy head, a dry mouth and the sense of having slept without resting are all signs that the drinking reached into your sleep. Keeping a simple note of how many drinks you had and how you slept for a couple of weeks often shows your personal threshold more clearly than any general rule.

Where you drink matters less than when. A late party and an evening on the sofa with a bottle of wine both leave alcohol in your system at bedtime. If you know a late night is coming, plan a calmer next evening and an early, alcohol-free night to catch up.

When it is more than a bad night

If you regularly need alcohol to fall asleep, or you are waking most nights and drinking to get back down, that pattern is worth discussing with a clinician. Loud snoring with gasping after drinking can also signal breathing problems during sleep that deserve a check.

For a one-off late night, the most useful mindset is patience. Your sleep will usually recover once the alcohol is out of your system, especially if you keep your usual wake time the next morning.