Sleeping on the floor is never a pleasant thing.
I didnt pack a winter coat because I was headed to south Texas during the summer. Ended up staying there during the winter and decided to fly back to salt lake for the holidays. Nothing like going from 75 on a beach to -5 in a blizzard and then not having a coat. I stayed in bed all day trying to get warm.
Good point snwbrder, I had a similar experience going from NC to New Hampshire. Got off the plane and it was at least 20 degrees colder; not good for shorts, t-shirt and sandals.