One of the most challenging parts of being a parent is the lack of sleep . Kids wear you down to the point of exhaustion and keep you up at night worrying about them. It's an incredibly unfair catch-22 of the human experience. My poor mother has been unable to sleep since I was born, and I wish I hadn't done that to her. I'm a sprite 23-year-old baby, so naturally, I've never had any problem with sleeping. I just know that if and when I pop a child out of my body, I'm going to stay up all night…