Alcohol is a nervous system depressant so it makes sense that it will make the heart more sluggish for a while afterwards, and temporarily yield a lower heart rate variability. i.e. higher stress values.
So anyone having trouble with stress scores, that's my first tip: if you're drinking alcohol every day or most days (even a healthy amount like 1-2 glasses of wine), quit doing that and see what happens.
Makes a massive difference.
All these people complaining about high stress scores, I wonder if they're treating themselves to a glass of wine or two with dinner every night (nothing wrong with that if they are). But it will definitely cause the "stress" results to go up, for the above reason, and also because your body has to work to process it.
I was drinking a couple of beers on most days in the evening after work or training, and my stress score was really high, even while I was sleeping. Recently I decided to stop drinking totally just to see what would happen to my heart data with the watch and it made a big difference. When I was drinking a few beers most nights (and even more at dinner parties or whatever), then I'd be lucky to get a few blue lines even while I was sleeping. After only four days without any beer or caffeine, I'm actually getting blue lines during the day just while I'm just sitting down at my office, and it's totally blue all night. My stress scores have dropped by a about 35 points.
So anyone having trouble with stress scores, that's my first tip: if you're drinking alcohol every day or most days (even a healthy amount like 1-2 glasses of wine), quit doing that and see what happens.