How do parents do it?

I am exhausted. Bleary eyed, slow of wit, prone to mistakes. My mouth tastes like dust and my eyes are reminiscent of the Kalahari. What could be the reason? The reason's name is Larry, the four month-old puppy we got yesterday. Apparently Larry doesn't sleep for more than three minutes at a time. And this is less than twenty-four hours with a puppy. A real-life crying baby day-after-day with all the added pressure and effort would be a truly frightening load. I salute all of you crazy people who are responsible for the continuing existence of the human race, you guys are nuts.