[schwap]

FWIW anecdotally, I notice my resting HR is often elevated any time I'm sick, or even hungover.

[GordonS]

Same here - cold, flu, infection, and yes, hangover. I always assumed it was the same for everyone, but apparently not everyone has an elevated heart rate when hung over - or perhaps they just don't notice it as much.

[michael_michael]

There's a condition called "Holiday Heart", which can be triggered by binge drinking. It can lead to palpitations, arrhythmia and atrial fibrillation:

https://en.wikipedia.org/wiki/Holiday_heart_syndrome