Since I've moved to college, I've occasionally had trouble sleeping. Some nights I have just stared at the ceiling until 1:30 AM, when I promptly fall asleep. It hasn't happened often, but this current bout is especially troubling.
It's 4:00 in the morning, and I'm still awake. Wide awake, in fact. I tried turning my fan on, turning it off, adding covers, removing covers, reading a book, playing some Madden, listening to podcasts, and nothing has made me the least bit tired tonight. I'm really worried this will make me crash hard in classes tomorrow (fortunately my exam was today, not tomorrow).
Got any suggestions on how to get a good night's sleep when you're restless?

<-- has his image of dejlige danmark thoroughly shattered

You wouldn't be able to find it in a vitamins aisle in the UK or most other countries. Melatonin was touted as being the new wonder sleep drug a while ago, but it has had mixed feedback. Iin most countries it is controlled, I think partly because it had something to do with being a hormone extracted from cattle (hey, you thought milk was bad!). I think it is available on perscription here for fatigue. It's not regulated by the FDA in america because people are selling it as a dietary supplement.
You could try it. I would advise that there's a reason it's not so available in the UK, it's because exceeding the recommended dose (or sometimes even following it), can actually harm sleep, and have negative effects.

I find more of the "esoteric hippies" nowadays going for raw milk (non-pasteurized, non-homogenized) straight from the cow.
Being lactose intolerant myself, I can actually drink larger quantities of milk when it's raw compared to processed milk. The processing (flash heating, etc.) kills off bacteria and such in milk that aids in it's digestion. Couple that with how a lot of dairy cattle in the US are fed crazy amounts of hormones, an argument could probably be made for regular off-the-shelf milk being not so good for you.

All of the advice so far has been rather great :) so I can't add much more, but regardless, let me add my two little cents...
I think the very aspect of sleeping in a new and foreign space contributes greatly to your difficulty in sleeping, at least I've found this to be the case when I moved into my college quarters for the first time. I can't say many methods worked for me, despite working out, running, fencing and playing tennis every day.
This might not work for you, but it certainly did for me: I decided to finally see a doctor, he was gracious enough to write me a repeating script for some sleeping medication (I think it would be rather useless giving you the names as the drugs in the U.S. I'm sure are called something quite different from here in South Africa). They were not OTC (over the counter, non-perscription) drugs - those have never worked for me. Anyways, the pills I were given were generally 10mg dose per pill, I then halfed each pill so that the dosage was reduced and found that they work rather well at just helping me relax and initiate the sleeping process. After a few days of using them I became used to my environment and no longer needed them - well, except at the odd time when I still take one.
If you do consult a doctor about this and plan on getting perscription medication just be aware that some of the sleeping-pills on the market are habit-forming, but there are several which are not. If you think you might be using them for a protracted period, inquire about the non-habit-forming types. Perhaps consult campus/student health, they might have a GP that could assist with your plight ;)
Anyway, I hope this helps :) Best of luck to you mate, and hope you sleep well :)

Chloroform and a rag.
Though no guarantee that you'll be able to wake up on time the next day. Or at all.

Blackjack to the head. Works like a charm.

Try drinking Camomile tea.
And for a better alternative than prescription drugs, try taking valerian in capsule form. Even better, MEXICAN valerian.
KO

I'm going to assume you mean exercising in the shower makes you tired and not the hot water, right? ;)

Look, I'm going to go full frontal. If you can't sleep, phone your friend the anesthesiologist. One general anesthetic later you're completely under, and just about ready for surgery.
On second thought, don't. Save your kidneys.