Now you've been talking in your sleep

from Pink (Ft. Nate Ruess) – Just Give Me a Reason Lyrics on Rap Genius

Meaning

While he sleep, he says things she is not supposed to hear.
When someone is asleep and relaxed, often they let their guards down and may mumble secrets or feelings they meant to keep. This line refers to how the female (P!nk) overheard what he truly feels

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