摘要：I know you made a mistake, but I wouldn't lose sleep over it. （我知道你犯了一个错误，但我不会为此担心。）[剑桥高级学者辞典]

lose sleep含义是“失眠”，lose sleep over就是“对.....睡不着觉、担心”，如

【例句1】I didn't lose too much sleep over that investigation. （我不担心那次调查。 ） [柯林斯高级学者辞典]

【例句2】I know you made a mistake, but I wouldn't lose sleep over it. （我知道你犯了一个错误，但我不会为此担心。）[剑桥高级学者辞典]

【例句3】It's a practice game – I wouldn't lose any sleep over it. (这是一场练习赛，我不会为此焦虑。) [朗文当代英语词典]

“失眠”的名词是insomnia。

来源：永远热爱下去