You may already have a favorite place, but in my experience, the high temple of napping is the university library. It is a place so good for sleep that it comes close to justifying the whole pursuit of higher education. Libraries combine several good conditions for sleep—namely boredom, silence, and soft lighting. But what’s so rewarding about this kind of sleep is that you typically give into it only after a fight. You’ve come to the library, ostensibly, to study; perhaps you’ve a paper to write or test later in the week. But the room is a little too warm, the lights a little too dim. There begins a protracted battle to stay awake. As the head begins to fall, you pick it up and give it a shake, but it does not help. The vision grows blurry. As the head falls onto the page, you may not even be aware of the moment of surrender. The subconscious mind has defeated the ego, and five minutes can feel like five hours. The only problem is waking up in that familiar pool of your own saliva, with arms and legs frozen solid.