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THE PLAIT GUIDE

How long does alcohol affect WHOOP recovery? What HRV and resting heart rate show

Plait editorial · Updated

Studies link drinking to a higher resting heart rate and lower HRV during that night’s sleep, with larger changes after more drinks. How many nights the effect lasts is less clear, so comparing the next three nights with your own baseline is more useful than waiting for a fixed reset.

What WHOOP recovery is built from

WHOOP calculates Recovery as a score from 0 to 100% when you wake, using measurements from the previous day and your sleep, including resting heart rate, heart rate variability (HRV), respiratory rate and sleep. Alcohol can change several of those overnight inputs at once, so a lower score after drinking is not surprising. The score alone does not show which reading changed or why.

What studies show about the night of drinking

In a WHOOP-funded analysis of nearly 21,000 members, drinking one more drink than a person’s usual amount, compared with one fewer, was associated with a sleeping resting heart rate about 2.4 to 2.8 beats per minute higher and HRV about 3 to 4 milliseconds lower, along with shorter sleep and less activity the next day. Effects were larger in women and younger adults. A study of 4,098 Finnish employees found dose-dependent shifts in heart rate and HRV during the first three hours of sleep, even after low intake. In a laboratory study of 26 adults, drinking before bed raised nocturnal heart rate and suppressed HRV, most clearly after three drinks for women or four for men.

Sleep changes as well

A 2025 meta-analysis of 27 studies found that alcohol delayed and reduced REM sleep. REM disruption appeared after a low dose of about two standard drinks and grew with larger doses, while falling asleep faster was seen only after about five drinks. Effects on total sleep time and night waking were uncertain. A US standard drink contains about 14 grams of pure alcohol, such as 12 ounces (355 ml) of 5% beer or 5 ounces (148 ml) of 12% wine.

How long the effect lasts

Those studies measured the night of drinking and, in the WHOOP analysis, the following day’s activity. They do not establish a universal timeline for the second or third night. Later nights can also be affected by a late bedtime, travel, a hard workout or a short sleep opportunity, which makes the cause harder to separate. Treat 72 hours as an observation window, not a deadline by which your scores must return to normal.

Compare three mornings with your own baseline

Note the date and roughly how many drinks you had. For the next three mornings, compare recovery, HRV, resting heart rate and sleep duration with your usual range from the previous one to two weeks. Record bedtime, training, travel and any illness, because they move the same readings. In the WHOOP analysis, drinking earlier than usual, sleeping longer afterward and keeping activity lighter were each associated with smaller disruptions. Those are associations, not a protocol that guarantees a score.

What Plait shows and what it does not do

For WHOOP members, Plait’s dashboard shows your latest recovery with HRV and resting heart rate, plus recovery and HRV trend charts. Plait does not log drinks, does not change your calorie target because of a recovery score, and does not offer a supplement or meal protocol to offset alcohol. This guide is general information, not medical advice. If your drinking or changes in your readings concern you, talk to a qualified health professional.

Further reading