Exhausting Myself

I've recently discovered how much I seem to exhaust myself. I used to blame work for my state of exhaustion, but now that I think about it, I'm the one who works 8 hours, then comes home and watches TV for a few hours, then spends even more time on the computer, until it's 2 am and I finally go to bed. Then I wake up and repeat the cycle! I've desperately been trying to break this habit of staying up too late, and waking up to late. I tried going to bed early last night, but I couldn't fall asleep until 1. Then, I didn't wake up until 10 today, because I just put my alarm on snooze...

I wake up so tired all the time, and I have no idea why! So I've decided to set some goals for myself.
1) Go to bed by 12, 1 am at the very very latest.
2) Wake up by 9 o clock at the latest.
3) Actually get dressed and stuff before noon everyday.
4) Get used to a normal schedule again, like eating breakfast and lunch at different times -_-

I know my overpowering will to sleep until the moon is out, my nocturnalism , will push my goals out of view, but I hope I can actually work this whole goals, and sleeping better thing out. School starts in 2 weeks, and I don't want to be this exhausted on the first day of hell.