Wiktionary
lose sleep
vb. (context often with ''over'' English) To worry.
Usage examples of "lose sleep".
Aside from that, they've kept me ignorant, and I can't lose sleep waiting to learn their next move.
He was one of the few people that I would use the hand of flesh on, and not lose sleep over it.
She'd need a full carafe every morning if she continued to lose sleep like this.
It will make them lose sleep, wear them down, so that when we do get to them they'll be easier to kill.
You got your right to be an asshole just like everybody else, I won't lose sleep over it.