He's darling!!!!! My children NEVER have slept that long --- well, that's not true - when they became teenagers they slept that long.
I think your daughter is onto something. Bill Cosby has a comedy routine about he and his wife having an angel the first time...an absolute doll that slept well, ate well, NEVER caused a problem. So having such good luck, they decided they'd have another. And here she came....Beelzebub. LOL