When you're a parent, naptime is the second most-looked-forward-to moment of the day. It's the hour (or two, or three, if you're lucky) that you get to eat lunch, check email, do a chore or two, and maybe even rest yourself. That's what makes the phrase "dropped nap" so horrifying: It means that a day that began at 7 (or 6, or 5, if you're unlucky) now yawns open, like a gaping maw of death, to bedtime. There's no opportunity for respite: Just you and a toddler, covered in homemade slime, squabbling about whether it's Tuesday.