to wait up

Do you know the English phrase “to wait up“? Look at the conversation. Can you guess the meaning?

Wanda: You look tired Olivia. Are you OK?

Olivia: I didn’t get much sleep last night. I waited up for my son to come home. He came back at 3am!

Wanda: You must have been very angry!

Olivia: I was. He told me not to wait up for him, but I was worried about him.

Does it mean

a) Pick someone up

b) Stay awake, without going to bed

c) Wait for someone to come home

The answer is below! ↓

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Answer: b) Stay awake, without going to bed