High heart rate morning after drinking

Hi, everyone. Sometimes, the morning after drinking, I wake up with a resting heart rate of 130-140 bpm. It does gradually decrease throughout the day, but still tends to stay higher than usual like within the 100-120 BPM range until the hangover is fully over.

I’ve had ECGs and other tests before – no detected or known issues with my heart.

I’ve read that it could be due to dehydration / just typical hangover symptoms, but another post says that it’s also known as holiday heart syndrome which could be deadly. Not sure how seriously to take it, but I was wondering if anyone experiences anything similar. I tend to just take a propranolol which helps lower it.