Lost Boy Found

I don't think I've ever been so truly frightened in my life!

I'm watching a friends child today, he and Matthew were having a great time playing...I could tell that W and Matthew were getting tired…. So I gave W a book and some toys and a coloring page and told him that I was going to rock Matthew to sleep and that I'd come back out when Matthew fell asleep, we took a potty break… went to rock Matthew to sleep, not hearing much noise thinking "it worked, W is asleep too!" I expected to come out and see W asleep in his book on the computer room floor, right where I left him… but… he wasn't there.
A glance into the living room and the kitchen… no W… Matthew's room? My room??? No… the bathroom?!?! No! I start to panic… where has he gone? I did have him this morning, Didn't I?!? Maybe he went to the basement?? No… in a closet? Under the bed?!?! No signs of him outside either. In a panic, I call Erik "I've lost W!!" I say, almost in tears... And as I walk around to pace in the living room, there is W, peacefully sleeping behind the chair, by the window.