It starts from the very second you become a mom. You are so exhausted after labor. And you pretty much live there, in a walking zombie coma, for the rest of their childhood days. You learn to live on little sleep from being up throughout the night for feedings, nightmares, bedwetting, illness and any other reason a babe can find not to sleep. So you quickly learn the true meaning of coffee. Like triple shots of coffee. And you adjust and it becomes the new norm and you are completely in love, but exhausted.