Meaning of 'lose sleep'

[Kris]

Test No. incompl/inter-61 "Losing It (1)", question 6

Yes, it's a slight problem but quite honestly I wouldn't lose any ......... over it if I were you.

(a) rest
(b) sleep
(c) time
(d) slumber

Test No. incompl/inter-61 "Losing It (1)", answer 6

Yes, it's a slight problem but quite honestly I wouldn't lose any sleep over it if I were you.

Correct answer: (b) sleep

Your answer was: correct
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what's the meaning of this sentence?

Thank you!
Kris

[Alan]

This means worry about something.
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English as a Second Language
You can read my ESL story Word Story: Health