I've had invisible animals rub against my legs while standing still; I don't know what they were. One night I was awoken by a loud sound; my heavy nightstand was pushed sideways against the wall...that startled me! I remember the time something woke me up by removing the smoke detector and throwing it in the bathroom. Whatever was in the attic was far bigger than a raccoon...it stayed for a week or so then left. It made noises above the master bedroom and only made noises during the day. To replicate the sound, I would have to put all of my 6'2" 190 lbs of force on the 2"x4" beams and stomp very hard!