Insomnia vs Internet?

I use my computer almost every day, several hours a दिन and I believe the line between not being able to sleep and being willing to sleep has become blurred and undefined. Unless आप actually know stuff, I'm just a बिना सोचे समझे kid that doesn't know that much about the human body, hasn't been to college, doesn't have experience with any medical... anything.
However, I'm curious, could I have insomnia, या do I just stare at screens too much? I usually fall asleep around 9, maybe 11 if I'm busy with homework या something keeps me up(Mom, could आप please stop working evening shift and waking up our pets?). I wake up at 6:30 on school days, if we have days off I sleep in until 9-11. However, my concern is that I frequently wake up around 3-5 am for about 30 minutes, I'm assuming this isn't normal for most people, and I literally cannot remember the last time I was not tired waking up.