You may not realize it beforehand,...
You may not realize it beforehand, but when you decide to have a baby, you also decide to have a messy breakup with sleep. Why "messy"? Because you and Sleep aren't ending your relationship mutually with a long walk on the beach, final lingering hug, and tandem tear-stained cheeks. It's more of a coming home and finding that Sleep dumped all of your crap on the lawn and set fire to them kind of breakup. It's ugly. And it's not Sleep, it's you. Actually, it's more the third wheel who just entered the party: Your baby.