Cant Sleep

This is a pretty common problem for me. It started my first year of university, i have a hard time sleeping at normal times. My typical day goes like this

6am: wake up, feel like crap
6am - noon: feel like crap unless theres something big going on at work that demands alot of attention from me
noon - 4pm: feel alright
4pm - 7pm: get real tired again, sometimes nap but i try not to because it just makes it harder to sleep at a proper time again.
7pm - 10pm: generally feel fine
10pm - 3am: feel really awake and good

So i feel the best after 10pm, which makes it really hard to fall asleep at midnight like i ideally would every night. Tonight i originally went to bed at 12 30, gave up around 2 15. Its now closing in on 3 meaning best case scenario i get 3 hours sleep tonight. And despite getting only 3 hours sleep ill have the same problem tomorrow, although probably not as bad.