Is peep followed by 'in' or 'into'?
The verb "peep" or "peeped' is often followed by "in" or "into",
based on the noun/pronoun and verb tense.
Example sentences:
I wanted to just peep in the window and quietly leave.
I peeped into the cage but feared waking the sleeping bear.
He peeped into the room so he wouldn't wake his sleeping
child.