Noah sometimes sleeps with his eyes partially open. It's super creepy looking and you can only see the whites of his eyes. It's like he's too tired to actually close his eyes all the way.
Darwin does this all the time as well. You can only tell if he is sleeping on his back though, otherwise his hair covers his eyes and you can't see anything... he he.
Lilly sleeps with her eyes partially open too. The only time I think they are shut are at night. I tried and tried to get a picture of her sleeping and as soon as I make one move her eyes are wide open.