Definition of lose sleep in US English:

lose sleep

phrase

  • usually with negative Worry about something.

    ‘no one is losing any sleep over what he thinks of us’
    • ‘The Pope, who aides say is losing sleep over the possibility of war, celebrated a Mass that began with a stiff wind blowing in from Siberia over the flat steppes and ended in sunshine.’
    • ‘The worst thing that the civilised world lost sleep over was the impending Millennium.’
    • ‘It's a brave move and I must admit I have lost sleep over it.’
    • ‘I struggled with this and even lost sleep over it.’
    • ‘When she was five, I lost sleep over sending her to kindergarten.’
    • ‘The owner says he has avoided layoffs, but he's losing sleep.’
    • ‘It is not something I lose sleep worrying about.’
    • ‘He lost sleep trying to find the right tone, but shedding the classical acting style helped.’
    • ‘But people now losing sleep over looming crime should control the urge to adopt desperate devices, which may also cause them to lose friends.’
    • ‘True, from time to time, feelings will be hurt in these discussions, but why lose sleep worrying about the self-esteem problems of politicians?’
    fret, be worried, be concerned, be anxious, agonize, brood, dwell on, panic, get in a panic, lose sleep, get worked up, get in a fluster, get overwrought, be on tenterhooks
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