I've been sick so often now (thanks kids) that I can feel _immediately_ when something is coming on. Rather than be down and useless at home and work for 2 or 3 more days, I tag out, go to bed and usually knock it out in a night. I feel like that's way better for me and everyone else overall.

> So many reasons why you might be sick for one day.

I'd bet a fair few "under the weather" days are because people have mental health issues but aren't going to announce that publicly (due to the ongoing stigma.)