He has turned so clingy and cuddly lately. Why?

My boyfriend has turned so clingy and cuddly lately. We usually sit on opposite ends of the couch to watch tv. Lately he has been wanting to lay with his head in my lap. Last night, I sat on the couch for about 5 minutes and he grabbed my blanket, covered up and layed with his head in my lap for over an hour. He normally stays up all night (as he usually works 3rd shift), but when I went to bed at 9ish, he came right in and went to bed with me. Nooooo there was no sex involved. All he wanted to do was cuddle. What the hell is going on? Why the change all of a sudden?
He has turned so clingy and cuddly lately. Why?
Post Opinion