睡懒觉

A: Are you all right? You look a little bit limp.

B: I feel drowsy all the time. The first few months of parenthood are tough. You’ll dream about sleeping in!

A: Indeed. We hired a sleep-in nanny to help us when my kid was young.

Note: In the first appearance here, the idiom means “to sleep later than one is normally accustomed or allowed to, either by mistake or on purpose.” In contrast, “to oversleep” means “to sleep longer than usual by mistake.” For example: I slept in and missed my usual train. This term can mean another thing, which is “to sleep at one’s place of employment at night,” as seen in “sleep-in nanny.”