起きてるの

are you awake?

→ 起きる
phrase Rare #32,824
are you awake? 起きてる is a casual contraction of 起きている, meaning “be awake” or “stay up.” の often makes the question sound conversational.
JA: まだ起きてるの?
EN: Are you still awake?

なんでこんな時間まで起きてるの?

Why are you still up this late?

あなた本当に起きてるの?

Are you really awake?

なぜ起きてるの?

Why are you up?

— 嵐の中で (2018)

トムはほとんど毎晩、深夜過ぎまで起きてるの。

Tom stays up past midnight almost every night.

彼女はどうしてまだ起きてるの?

Why is she still awake?

トムはまだ起きてるの?

Is Tom still awake?