Were you reading the Outsiders to him?
It's a traditional lullaby that folks (including Bruce among others) have done. I remember my Grandfather singin' it to me. I usually cross my legs and put the grand nephew on my foot (like riding a pony) but since he was hooked up to tubes, I just put him on my chest and rocked in front of the window. Boom .... out. I hope it wasn't my singin'.