The mind will function more effectively while you are studying after a good laugh. You'll also be less likely to fall asleep. Each of us has our own style of humor. To better learn about your humor profile, you should make a collection of your best humor sources. You can make a library of funny stuff in your house to let you take a light laugh break when you really need it.
People are more likely to laugh in social context.
Without TV, radio, or books, people are more likely to laugh in a group. Most laughter is in the context of conversation, not as a response to any structure attempt to provoke laughter. Speakers to a big audience usually laugh more than the listeners do and females tend to laugh more than males. By observing a conversation between a male and a female, one can notice that males are the leading humor producers and females are the leading laughers.