Does alcohol lower HRV?
Yes, the same night. In 20,968 WHOOP members, a night with one drink more than their usual, against one less, came with HRV about 3.8 ms lower in women and 3.3 ms lower in men. More drinks lowered it more. Drinking earlier in the evening helped a little.
A glass of wine feels relaxing, so it seems like it should help. Your heart sees it differently. In 4,098 Finnish workers who wore heart rate straps, the first three hours of sleep after drinking showed a faster heart and less variation between beats, even after a low dose.
What we’d do: if you drink, drink less and finish earlier, and expect a lower number that night. A dip after drinks is the drinks showing up. It says nothing on its own about lasting harm.
How much, and for whom?
| Finding | Size | Study |
|---|---|---|
| One drink above your usual, against one below | HRV 3.8 ms lower in women, 3.3 ms in men. Sleeping heart rate 2.8 and 2.4 beats higher | 20,968 WHOOP members, 5.1 million days, 2026 |
| Drinking an hour earlier instead of an hour later, women | HRV 1.5 ms higher | Same study |
| Five drinks above your usual, people in their 20s against their 30s | HRV a further 3.0 ms lower in the younger group | Same study |
| Low, moderate and high doses, first 3 hours of sleep | A strap-based recovery measure fell by 9, 24 and 39 points | 4,098 Finnish workers, 2018 |
In the WHOOP study, the dip was larger in women and in younger adults. Sleeping longer after drinking and being less active that day each made it smaller. The drinks were self-reported, and WHOOP funded the work.
Drinking also goes with HRV that is less steady from night to night. In about 2 million nights from more than 21,000 wearable users, more alcohol went with HRV that swung more across the week.
Test it on yourself
- Take two weeks of nights on one device as you usually live.
- Take two weeks with no drinks, or with drinks finished early.
- Compare the two averages. If the dry or early weeks sit clearly higher, you’ve found one of your levers.
If you drink heavily every day, talk to a doctor before you stop suddenly, because withdrawal can be dangerous.
3 sources
- Grosicki GJ et al., Real-world effects of alcohol on heart rate, sleep, and physical activity by age and sex, PLOS Digital Health, 2026pubmed.ncbi.nlm.nih.gov
- Pietilä J et al., Acute effect of alcohol intake on cardiovascular autonomic regulation during the first hours of sleep in a large real-world sample of Finnish employees, JMIR Mental Health, 2018pubmed.ncbi.nlm.nih.gov
- Grosicki GJ et al., Heart rate variability coefficient of variation during sleep as a digital biomarker that reflects behavior and varies by age and sex, American Journal of Physiology Heart and Circulatory Physiology, 2026pubmed.ncbi.nlm.nih.gov
