My 4 month LO will lift her legs straight in the air and slam them down on her bassinet mattres in the middle of the night. She sleeps in the bassinet attachment of her Pack and play in our room. DH is convinced this is extremely odd and something is wrong. I'm not so sure it isn't pretty common and she's half asleep. None the less it makes the loudest sound and we are up just listening in the middle of the night when shes already up every hour to hour and a half. Anyone else have this?