Sleeping after drinking is tricky because alcohol disrupts nearly every aspect of normal sleep. The first half of the night often feels deep, but the second half typically turns restless, fragmented, and light. There are practical steps you can take to sleep more safely and reduce how rough you feel in the morning.
Why Alcohol Wrecks Your Sleep
Alcohol initially acts like a sedative. It boosts the brain’s main calming chemical (GABA) while suppressing its main excitatory chemical (glutamate), which is why you feel drowsy and fall asleep faster than usual. During the first few hours, you get more deep sleep than normal and almost no REM sleep, the stage tied to dreaming and memory processing.
The problem starts once your body processes the alcohol. Your brain overcompensates for the earlier sedation by ramping up that excitatory signaling. This rebound effect is why you wake up at 3 or 4 a.m. feeling wired, sweaty, or anxious. The second half of the night brings fragmented, shallow sleep with frequent awakenings. Even if you stay in bed for eight hours, the overall quality is significantly worse than a sober night.
Your body clears alcohol at roughly 15 to 20 mg/dL per hour for most people, which translates to eliminating about one standard drink every 60 to 90 minutes. If you had six drinks and stopped at midnight, your body may still be processing alcohol well into the early morning hours, meaning your sleep is disrupted for most of the night.
Sleep on Your Side, Not Your Back
The single most important thing you can do is sleep on your side. Alcohol relaxes the muscles in your throat and suppresses your gag reflex. If you vomit while lying on your back, you can choke. This is a real and serious risk, not a rare worst-case scenario.
The recovery position is the safest option. Lie on your side with your face angled slightly downward so any fluid drains out of your mouth rather than back into your throat. Bend your top knee forward to keep yourself from rolling onto your stomach. If you’re helping someone else who is very drunk, place their arm closest to you out in an L-shape near their head, then roll them toward you onto their side. Check that they’re breathing by holding the back of your hand near their mouth.
Prop a pillow behind your back if you tend to roll over in your sleep. If you’re helping a friend, check on them periodically. Someone who is unconscious, breathing irregularly, or cannot be woken up needs emergency medical attention, not just a pillow and a dark room.
Hydrate Before You Lie Down
Alcohol is a diuretic, meaning it makes you urinate more than the volume of liquid you took in. By the time you’re ready for bed, you’re likely already dehydrated. Dehydration contributes to the headache, nausea, and general misery of a hangover, and it also makes nighttime sleep more restless.
Drink a full glass or two of water before getting into bed. If you have an electrolyte drink or even just some salty crackers alongside the water, that helps your body retain the fluid rather than sending it straight to your bladder. Avoid chugging a huge amount right before lying down, though. Too much liquid at once just means more bathroom trips, which further fragment your already compromised sleep. A steady approach works better: alternate water with your drinks during the evening if you can, then have a final glass before bed.
Keep the Room Cool
Alcohol causes blood vessels near your skin to dilate, which is why you feel warm or flushed after drinking. This vasodilation raises your skin temperature but actually lowers your core body temperature, disrupting the natural temperature regulation your body relies on for good sleep. Research shows that even moderate alcohol intake alters the normal circadian rhythm of body temperature, producing higher temperatures at night than your body expects.
A cool room helps counteract this. Keep the thermostat around 65 to 68°F (18 to 20°C), use lighter blankets than you normally would, and skip the heavy comforter. You may feel cold initially, but your dilated blood vessels are radiating heat, and overheating during the night is one of the main reasons alcohol sleep turns restless.
Eat Something Substantial
Food in your stomach slows alcohol absorption, which is more useful before drinking than after. But even after the fact, a small meal can help stabilize blood sugar through the night. Alcohol interferes with your liver’s ability to release glucose, and the resulting blood sugar drop can wake you up feeling shaky, sweaty, or anxious in the early morning hours.
Reach for something with carbohydrates and a little protein: toast with peanut butter, a banana, crackers and cheese. Avoid anything very salty or high in protein right before bed, as both increase urine production overnight.
Skip the Sleep Aids
It might seem logical to take melatonin or an over-the-counter antihistamine to help you sleep, but mixing these with alcohol is a bad idea. Both melatonin and antihistamine-based sleep aids slow down your central nervous system, and combining them with alcohol, which does the same thing, can cause excessive sedation, worsen breathing problems during sleep, and make it harder to wake up if something goes wrong.
A 2002 case study documented someone who combined melatonin and alcohol in the same evening and experienced rapid heartbeat, dizziness, hallucinations, flushed skin, and disorientation. Melatonin also commonly causes a paradoxical waking effect where people wake in the early morning hours and can’t fall back asleep. Alcohol makes that rebound worse. The safest approach is to let alcohol be the only substance affecting your system and manage sleep quality through hydration, positioning, and environment instead.
Extra Caution if You Snore
Alcohol relaxes the muscles in your upper airway, which makes snoring worse and can significantly increase the severity of obstructive sleep apnea. Meta-analyses show that alcohol consumption worsens both the duration and frequency of breathing interruptions during sleep while also reducing blood oxygen levels. If you already snore heavily or have been told you stop breathing in your sleep, alcohol amplifies those risks considerably.
Sleeping on your side rather than your back helps keep the airway more open. If you use a CPAP machine, wear it. The temptation to skip it after drinking is understandable, but this is exactly when you need it most.
Give Yourself Extra Time
Since the second half of your sleep will be lighter and more broken than usual, plan to stay in bed longer than your normal schedule allows. If you typically sleep seven hours, give yourself eight or nine. You won’t fully make up for the lost sleep quality, but more time in bed at least gives your body additional chances to cycle through the lighter sleep stages that dominate the back half of the night.
If you wake up in the middle of the night and can’t fall back asleep, that’s the glutamate rebound at work. Your brain is now in an excitatory state that’s the opposite of the sedation you felt earlier. Don’t fight it by staring at the ceiling. Get up, drink some water, sit somewhere dim and quiet for 15 to 20 minutes, then try again. Lying in bed frustrated only makes the wakefulness worse.