Yes, bats, flushing toilets and...
We were last in a 5th floor, CYV room in December and all 8 nights I noticed the flushing toilets, too

. It seemed to be coming from the wall behind the headboard. We also had a room with a connecting door. I always request not to have one, but we were upgraded to CL so I didn't want to complain. I learned the hard way, I will never accept a room there again with a connecting door. Every morning and late at night we were regaled with very loud neighbors and we could hear every single word and we couldn't fall asleep some nights until well after midnight. I've had rooms at all the other Deluxes, except the GF, with connecting doors, but have never noticed this level of noise - it was like they were in our closet!