Your mom, before she was a mom, was the best sleeper of all. When we were younger, she'd sleep so hard and so late. I remember going into her room on weekend mornings and begging her to "wake up! wake up!"
Single uncles walk an undefined line in a family. Being accepted as a bachelor (in most cases without children) is the start, but then, if he cares, comes the role the uncle carves in the family geography.