to lose sleep over/about something
to worry about something:
I wouldn’t lose any sleep over what happened.
Yes, Kelly is in a little bit of trouble, but I’m not going to lose any sleep over her.
Don’t lose any sleep over the matter. I refuse to lose sleep about it.
No one is losing any sleep over what he thinks of us.
True, from time to time, feelings will be hurt in these discussions, but why lose sleep worrying about the self-esteem problems of politicians?
It is not something I lose sleep worrying about.
It’s a brave move and I must admit I have lost sleep over it.