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Not lose sleep/lose no sleep over something

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LampPro Tip 1/3
Emotional DetachmentPlay
Shows you're unaffected emotionally by an event or situation. SlideShe didn't get the promotion, but she's not losing sleep over it.
LampPro Tip 2/3
Informal ExpressionPlay
Used more in casual conversation than in formal writing. SlideWe lost the game, but we're not losing sleep over it.
LampPro Tip 3/3
Positive AttitudePlay
Implies a positive or resilient attitude in the face of problems. SlideThe deal fell through, yet he's not losing sleep over it.