I used to get it all the time and it definitely happens to me less now that I am in a job I love, but I get a really strange feeling on Sunday nights almost like dread of the end of the weekend. It’s hard to put it into words exactly, maybe somebody else who gets it can do a better job than I have. Sets in around 3/4pm if I’m going to get it and sometimes find myself unable to fall asleep no matter how tired when I don’t have that problem any other night of the week.
It’s absolutely fine by Monday morning, in fact I don’t even mind Mondays quite enjoy getting back to being busy. Weird
YABU - I don’t experience this
YANBU - I do, fairly regularly and ikwym