I'm a little worried about the same thing too... A few months back my doctor prescribed me these tablets that really help you sleep. He prescribed 10 as a short term thing while I was having trouble sleeping for a few days, but the actual pharmacy somehow messed up my script and gave me a box of 100. Needless to say I've been taking them every night since for months now (only need to take a half and i'm out), and it's coming up to the end of the box. I've tried sleeping without them, but my mind and body just completely buzzes all night..
They are supposed to be non addictive, and in the respect of usual addictive sleep meds, they don't make you feel totally horrible when don't take them, you just don't sleep...
And considering how addictive sleep is in general, it's going to be painful laying there all night awake with work the next day etc.

Anyway good luck Miles... It's a hard one because for something like this, a really good doctor could help you - If you were honest and upfront with them, they could work out a plan to get you off them... The problem is most doctors have their heads up their moral asses though, and if you mention you even "think" you have a sleeping med problem, they'll close up like a clam and probably not want to prescribe you anything... Some might say "just have a warm drink before bed and read a book" (i've heard this one many a time)... So then you're like "fuck this guy" and don't go back to him, and he probably thinks this hardcore pill addict got of his meds by taking a warm drink and reading a book...

So if you can find a really helpful doctor then that will make things easier, but it's difficult to find any doctors that have actual decent knowledge in such area's and have the brains to figure out a treatment that suits YOU and not just them...