Have you tried maybe setting up a fan going at night (blowing away from you)? Or tuning a radio into the static between stations? Anything that can produce white noise is supposed to be very helpful.

Try also googling for some guided relaxation videos maybe on youtube. Or other places where they have the audio only.

One method that sometimes works for me is progressive body relaxation. I start at my toes and working my way up I tighten and relax sets of muscles until I get to the top of my head. Holding each tight part for about 5 secs. There are many mp3s that help with this. Look for the words "body scan". It can help sometimes get you in the winding down mood.

I hope you get some rest soon. I know too well how it affects the rest of your life when your sleep is disturbed (i'm up after 3 hours down myself tonight).

Oh! I don't know if they have it in the UK but melatonin is a good natural sleep aid as well. Look in vitamin and pharmacy shops.