Lose sleep over (something)

Do you know the English expression “to lose sleep over (something)“? Read the conversation below. Can you guess the meaning?

Harry: My daughter has started spending all her spare time in her room on her computer. What do you think?

Rachel: It sounds like normal teenager behaviour. I wouldn’t lose sleep over it if I were you.

Does it mean:

a) don’t sleep

b) worry about something

c) stay awake

d) wait for something

The answer is below!↓

 

Answer: b) worry about something