It's late and I can't sleep!

So, here I am, it's late Friday night, my family has all gone to bed, and I am still awake just because. This happens often. I haven't quite figured out why that is. Am I the only person who is like this? No matter how early I get up, by the time everyone else has gone to bed I am still awake because I can't go to sleep. Even when I try to go to bed my eyes just won't close. And no, it is not because of all the caffine I drank in the morning. When I am tired I go to bed but lay there awake for about an hour just because I'm awake. The whole situation is weird. Does anyone else live like this? Am I alone in the universe? Am I some kind of alien and just don't know it yet?