How to fix a sleeping pattern

Hi everyone,

My sleeping pattern is seriously messed up. I'm a college/university student, so one night out can ruin it for a long time and it's hard to get it back on track (so far I've been unsuccessful)

I eat dinner at 6-7ish, and I don't actually have snacks after that unless I'm starving, so it's not like an excess sugar rush keeping me awake, and if I am really hungry I either drink a lot of water or eat something like a piece of toast...

And then I get into bed at 11pm and try to drop off...nope. Not happening. I lie there for hours and hours sometimes! So I turn the lights back on and read for an hour, and then try again. Still nothing. Recently it's been worse than ever, I can't get to sleep and don't feel tired until at least 5am, and some days during the week I have to wake up at 8am for classes!

Even on days where I do a lot of cardio I'm not tired at night one bit. But I can't sleep in the day because of the sun (I just can't nap lol). The only time I'm really tired is in the morning when I wake up from my three hour sleep T_T but that's obvious.

Has anyone got any good ideas on how to fix this, because I think it's starting to affect my weight and metabolism. I don't overeat to compensate, but I've still heard sleep can aid weight loss. Plus it's just plain irritating. I want to sleep! If nothing works I think I'll have to go to the doctor, but I wanted to try other remedies first thanks!