Why is my recovery score low after drinking?
Because the score is built from your night, and drinks change your night. WHOOP Recovery, Oura Readiness and Garmin Body Battery all lean on overnight heart rate and HRV, and a drinking night pushes heart rate up and HRV down. None of them senses alcohol itself.
A red or low score the morning after drinks can feel like the device caught you, or like a verdict on your health. What it really saw was a faster heart and less variation between beats while you slept, and those are the two things alcohol changes most.
What we’d do
Take a low score after drinks as the drinks showing up, and let one bad morning go. Compare your drinking nights with your dry nights on one device. If you want the score back, drink less and finish earlier, since both came with a smaller hit in the WHOOP data.
How big is the hit?
Think of the score as a weather forecast built from a few readings. Drinks change the readings that go into it, so the forecast changes with them.
In 20,968 WHOOP members, a night with one drink more than usual, against one less, came with a sleeping heart rate 2.8 beats higher in women and 2.4 in men, and HRV 3.8 and 3.3 ms lower. More drinks moved both further. Drinking an hour earlier, against an hour later, and sleeping longer each made the hit smaller. WHOOP paid for the study, and members logged their own drinks.
In a 2021 lab study with medical equipment, drinks before bed raised heart rate and lowered HRV across the night, most after the higher dose.
WHOOP Recovery
WHOOP’s developer documentation says Recovery uses your resting heart rate, HRV and breathing rate, plus sleep, skin temperature and blood oxygen, from the previous day and night. It’s a percentage, with green at 67 to 100, yellow at 34 to 66 and red at 0 to 33. A drinking night moves two of those inputs at once. hrv.guide explains the HRV behind it on its WHOOP page.
Oura Readiness
Oura’s support page lists nine contributors, each judged against your own averages: resting heart rate, HRV balance, body temperature, recovery index, sleep, sleep balance, sleep regularity, previous day activity and activity balance. Two of them catch a drinking night directly. The resting heart rate contributor uses your lowest heart rate of the night and can drop when it’s 3 to 5 beats above your usual. Recovery index looks at how much sleep you get after your heart rate bottoms out, and Oura suggests avoiding alcohol and other late habits if that low point keeps landing in the second half of the night. HRV balance is a two-week trend, so one night moves it only a little. See hrv.guide’s Oura page.
Garmin Body Battery
Garmin’s manual says the watch uses your HRV, stress level, sleep quality and activity to set Body Battery, and compares it to a gas gauge for your reserve energy, from 5 to 100. A night of lower HRV and higher stress readings means less recharge by morning. See hrv.guide’s Garmin page.
Apple Watch
Apple Watch reports HRV as a different measure (SDNN) from the one WHOOP, Oura and Garmin use, so its numbers don’t compare with theirs. Track it against your own dry nights the same way. hrv.guide’s Apple Watch page has the details.
When will tonight's drinks clear?
Bed at 11:00pm
Mostly cleared by 2:50am
That's about 3.8 hours of your sleep with alcohol in your blood (3.1 to 4.9 if your liver runs faster or slower).
Restaurant pour6 oz, 13.5%, 1.35 US drinks- Restaurant pour6 oz, 13.5%, 1.35 US drinks
REM: More REM lost. Your evening is 0.56 g of alcohol per kg of body weight.
The full clock, with the band, the same drinks two hours earlier and what your heart does.
5 sources
- Grosicki GJ and others, Real-world effects of alcohol on heart rate, sleep, and physical activity by age and sex, PLOS Digital Health, 2026 (funded by WHOOP)pubmed.ncbi.nlm.nih.gov
- WHOOP, WHOOP 101, WHOOP developer documentationdeveloper.whoop.com
- Oura, Readiness Contributors, updated October 7, 2026support.ouraring.com
- Garmin, D2 Air X15 Owner's Manual, Body Batterywww8.garmin.com
- de Zambotti M and others, Impact of evening alcohol consumption on nocturnal autonomic and cardiovascular function in adult men and women: a dose-response laboratory investigation, Sleep, 2021pubmed.ncbi.nlm.nih.gov
