not lose sleep over something
idiomPart ofsleep
not lose sleep over something — idiom
1. to not let a problem or worry disturb your rest; to not be overly concerned abou
1.idiom
Definition
to not let a problem or worry disturb your rest; to not be overly concerned about something.
Example
It is just a small mistake in the report — do not lose sleep over it.
Marco was angry about the criticism, but he did not lose sleep over it.