Sammy could sleep against Dean if she wanted to. He was comfy. And, in fact, once in fifth grade, she had slept against him. She kinda wanted to do it again. And now Sammy couldn't wait for them to get away from all this drama and just go home. Lucky for them, Dean and Sammy lived in houses right next to each other and now and then, when one was lonely, their upstairs windows were close enough to tap on if they leaned out far enough. It made it easy for the pair to have sleepovers whenever. Unfortunately, May happened to live about 7 houses down from Sammy's so she had to walk to see them. It was still a great deal though.
Sammy snuggled against Dean's arm and simply waited for the bell to ring.