I agree, I've also noticed the elevators in my office building are on a schedule and behave differently during business hours than evening and early morning hou

I agree, I've also noticed the elevators in my office building are on a schedule and behave differently during business hours than evening and early morning hours. Maybe it's for the convenience of the after-hours cleaning staff, but after 7PM the close door button can even make the door close before it finishes opening upon arriving at a floor.