Does wine affect your sleep quality?

However you slice it, alcohol and sleep have a negative relationship. This is a well-established and extensively researched area in the scientific literature, with studies dating back to the late 1930s. Given how much information exists, it’s worth breaking down how alcohol affects sleep—and whether there’s a realistic way to reduce the damage without giving up wine altogether.

TL;DR

Alcohol helps you fall asleep faster, but it disrupts sleep quality by suppressing REM sleep early in the night and fragmenting sleep later on. The worst effects occur within about four hours of bedtime. A practical workaround? Drink earlier, finish well before sleep, and shift wine consumption toward daytime or social occasions rather than late-night “unwinding.”

Why Do We Get Tired?

Two core biological processes regulate when we feel sleepy or alert: circadian rhythm and sleep pressure. Together, they form the two-process model of sleep regulation, which explains why we’re generally awake during the day and sleepy at night.

The circadian rhythm is an internal 24-hour biological clock, coordinated by the hypothalamus, that governs sleep–wake timing and many other physiological processes. It’s primarily synchronized by light exposure through the eyes (yes, very Andrew Huberman) and triggers melatonin release in the evening to prepare the body for sleep.

Sleep pressure, on the other hand, is the increasing drive to sleep the longer you stay awake. It builds throughout the day and dissipates during sleep, ensuring the body gets enough rest and increasing sleep intensity if you’ve been sleep-deprived.

What Happens When We Sleep?

According to the American Academy of Sleep Medicine (AASM), sleep cycles through four biologically meaningful brain states that work together to restore both body and mind. These stages fall into two categories: Non-REM and REM sleep.

Each stage is defined by changes in brain activity (EEG), eye movements (EOG), and muscle tone (EMG). Sleep cycles repeat every 90–110 minutes throughout the night. Earlier bedtimes typically yield more deep (N3) sleep, while later nights shift sleep toward longer REM periods. I’m using this framework because it’s the one employed by most modern sleep-tracking wearables.

Although many people drink alcohol to help them fall asleep, this effect is temporary—and misleading. Alcohol is a central nervous system depressant, which can help you fall asleep faster, but it significantly alters sleep architecture.

Early in the night, alcohol increases deep (N3) sleep while suppressing or delaying REM sleep. Later, as the alcohol is metabolized, the body attempts to compensate. Because you’ve already spent excess time in deep sleep, the brain shifts toward lighter sleep stages (N1 and N2), leading to fragmented, less restorative sleep and more frequent awakenings.

Alcohol is also a diuretic, so you’re more likely to wake up to use the bathroom. And since it acts as a muscle relaxant, it can worsen snoring and sleep apnea by allowing soft tissues in the throat to collapse more easily. Ever notice that you sleep worse when your spouse has had a few drinks? This is often why.

The end result: you wake up feeling less rested—even if you logged plenty of hours in bed.

My personal Hell. Source: Creative Commons

The Secondary Effects

Poor sleep from drinking doesn’t just end with a rough night. It can worsen hangovers, as sleep apnea and fragmented sleep have been linked to more severe headaches. Alcohol also disrupts melatonin production, potentially impairing sleep quality the following night as well.

Late-night eating compounds the problem. Indigestion, acid reflux, and blood sugar spikes interfere with both circadian rhythms and the body’s overnight “cleanup” processes, making it harder to fall asleep, stay asleep, and achieve truly restorative rest.

What's the Move?

The evidence suggests that alcohol’s most disruptive effects occur within roughly four hours of sleep. Rather than cutting out wine entirely (let’s be realistic), I’m experimenting with changing when I drink.

If I imbibe earlier in the day and finish at least four hours before bedtime, I can dramatically reduce the sleep penalty. That means less mindless “unwinding” wine on weeknights and more intentional, social drinking—think long, boozy weekend lunches. (Is that what brunch is really for?)

Restricting drinking to daylight hours—and, by extension, weekends—also naturally reduces how often I drink. Is it a perfect plan? No. And plenty of scientists and doctors would still raise an eyebrow.

But then again… do any of us follow all their advice anyway?

Source: Creative Commons