Nighty-night Jokes

Once upon a time there were three coeds-a big coed, a medium-sized coed and a little tiny coed. One night they came home from a dance, and the big coed said, "Someone's been sleeping in my bed!"
The medium-sized coed looked in her room and said, "Someone's been sleeping in my bed!"
And the little tiny coed said, ".. . Well, nighty-night, girls!"