According to Stanford University's Sleep Disorder Clinic:

Here's a great reason to get your zzzzz. Sleep helps us learn better. According to the Journal of Sleep Research, the best way for us to learn and understand complex material is to sleep on it. And the sooner the better. HealthScoutNews reports that when a period of learning is immediately followed by a nap, the new information is incorporated in our dreams. When this happens, it turns up again and again as we sleep. It's this repetition that helps us master the complex concepts we were just taught in the classroom and establish the new ideas in our mind. This method of learning is actually better than writing down the information, reviewing the topic in the library, and highlighting notes--all common study habits of good students.

Yeah, I don't nap because I'm lazy. There's a reason I go to bed early instead of studying for tests. It's all about my excellent, unassailable study skills, yos. Nap for Knowledge! I like that.

Substance later.