Just be careful not to hurt anyone’s feelings or make someone sound bad. For instance, talk about the people you have a crush on, the people your friends have a crush on, the school gossip, or the TV shows or movies you like at the moment. Conversation stimulates the mind, and a stimulated mind is an alert mind. Scare yourself silly. Tell lots of super scary stories that will scare each other into staying awake. Try playing a truth or dare game in the dark outside, so you will be too scared to sleep. The thrill of hiding from whoever is "it" will keep you up! It is also a fun game to play when you have nothing to do. Do not hide lying down, or else you could fall asleep. Get outside into the fresh night air (if your parents approve of it).  Jump on the trampoline, play flashlight tag, run in circles, have races, or go swimming in the backyard pool at night (with permission from the parents). The cold air will help keep you awake. It doesn't matter if you are a good or bad singer, singing is a great way to pass the time while keeping your mind active. You could play a game like American Idol or The X Factor in your living room or bedroom, even outside. Just be sure not to wake those in the house trying to sleep.

Summary:
Try talking all night about exciting things. Play hide-and-seek in the dark. Go outside. Try singing.