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- lose sleep over
lose sleep over
lose sleep over someone or something
and lose sleep about someone or somethingFig. to worry about someone or something a lot, sometimes when one should be sleeping. (Often used with any and the negative.) 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.
not lose sleep over something
to not worry about something I don't intend to lose any sleep over this problem.
See it's swings and roundaboutslose sleep over
Worry about, as in It's too bad the experiment failed, but I'm not going to lose sleep over it. This expression, often put negatively, alludes to actual insomnia caused by anxiety. [First half of 1900s]