Zardnaar
Legend
Yes he's done that too. Recently in fact. It's forced us to find a secure area to rest, which means more encounters between rests, which was exactly the result he wanted. I hear people say they have 2 encounters total in an adventuring day, with a short rest in between them, and I think that's an alien concept. That's literally never happened to us, in the 11 years of playing 5e.
2 isn't normal for me butc1 or 2 have definitely happened occasionally.
Keep them guessing/whatever is organic.
Interrupting long rests with combat is a way to wear PCs down.