Worried about Dads

My husband is a GREAT dad to our beautiful daughter. She is 16mo old and crazy busy. I’ve recently come home from work and found him asleep on the couch while she’s playing in another room. He swears it’s only for a minute but he doesn’t hear me come in and I have to call his name multiple times to wake him up. It’s really making me nervous to leave her home with him. Am I being too cautious? I’ve told him and he just gets upset. Am I being too hard? I’m just so worried she’s gonna choke on something or fall and bust her head open or wonder out the door(which has happened on his watch!) he loves her so much but I don’t know what to do..