I think this is more of a problem of how you and your fiance interact than how you get to sleep. Once you get married, you will have to talk about lots of things together. Many pleasant and many not. But if you can't honestly talk about your problem with his sleeping style affecting yours, than the problem is communication - not your need for pills.
It's an important thing to talk to him about for many reasons. If he doesn't listen to you or minimizes your problem, then you've learned some very important information with which you can enter couples counseling or make other decisions.
Also, his restless sleeping and snoring may indicate a health problem which needs to be investigated. And surely if you can't sleep, you will have health problems too. Again, how you are able to talk about this and the attitude taken by both of you can be valuable information before you join your lives together for eternity. Your health should be as important to him as his is to you.