Night Owls

What makes some people night owls and some people morning people?? When I was younger, I liked staying up late and sleeping in. Now, I like to be in bed by 10 and am usually awake by 6:30 just naturally. Now that summer is here, I am starting to be able to sleep in later, like 8 am. My mom is an early bird. She wakes up naturally about 5:30 or 6:00 am everyday. Thus she used to be wiped out by 9:00 pm and ready for bed. Now, however, she stays up till around 11 so she can sleep better through the night. My dad is a night owl. He usually goes to bed around 11 and sleeps till about 9. Garry can stay up late reading, and on weekends he can sleep in till 9 or 10. I like to read at night too, but it makes me tired and I usually can only read for about a half an hour. Tanner can stay up till one or two on weekends reading too. He can also sleep in till 12 or 1pm!! He is cranky if he doesn't get to sleep in on weekends! He is loving summer. Taz, bless his heart tries to stay up late, but he usually conks out by 9:30 and is up by 7. He has been staying up later now that it's summer, and sleeping in until about 8. Cynjyn is about the same as Taz. Then there is TALON, dum dum da dum...I swear he is a vampire. He wakes up and gets his energy at about 10 at night. I just don't get it, he has always been this way. The night before I left for Canada, I went up to Talon's room. He and Tiffany were watching the basketball game on the TV. He was looking pretty tired and was almost asleep. I was telling him about Cynjyn's wrist. I went to bed at 10 because I was getting up early. I was awakened at midnight hearing Talon walking around downstairs. At 2am, I heard him heating something in the microwave. At 3 am I could hear his TV blairing. I went upstairs and told him to shut his door and turn it down. Why can't he sleep at night? Why do some people have insomnia? My friend Chris has insomnia, my sister has insomnia. Just some pondering while hanging out in Canada. By the way, Australia was good, long but good!