During nap time I could hear Eden run around her bedroom on occasion.
I went upstairs to tell her to take a nap so not to wake up Leila.
She had been taking things in the room and throwing them ON Leila in her crib. The biggest thing being a Boppy pillow. It was on Leila's head. I pulled it off (a little scared she was being suffocated) and Leila was still sleeping.
Guess she's a heavier sleeper than I thought.