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lose 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 ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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  • There seemed to be no reason why both of us should lose sleep over the same cause.

    The Victory At Sea William Sowden Sims
  • "Oh, you make a great mistake if you think I'd lose sleep over any man," she said, with lofty coolness.

    The Mystery of Murray Davenport Robert Neilson Stephens

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