Welcome to the forum!
I also have the same Rx problem - Zolpidem. I have done a lot of research on the matter (as have many on here) and from all indication we have picked a benzo that is in such a grey area. It's marketed like non-benzo, it's prescribed like it's not addicting, even the vaunted Dr. Ashton says you can just stop taking it (presumaby at doses 10-20mg daily) without feeling any protracted or serious withdrawal symptoms, and nobody really understands when or if one should substitute Valium if a taper is planned.
That being said, anecdotal experiences (the majority I have seen) and my own intuition (I am at 50mg a day, taking it in 2-3 doses for anxiery and sleep) tell me a few things -- 1. That whatever your dose, rebound insomnia is very real and very problematic when you stop taking Zolpidem; 2. If you are taking higher doses (like me) to avoid taking the "real" benzos (and there may be even less of a distinction here that even the best doctors realize), then you will probably have the same withdrawals as any other benzo; 3. A gradual taper will work; 4. Often you get a "mini-withdrawal" during the day from Zoplidem, because you effectively eliminate the drug in 8-10 hours. I have often thought that feeling like semi-crap every day should be "gutted out" because I would feel much better (and be Zolpidem free) if I could just go a few days, but, alas, I am chicken). I just got about a 12 day supply, but one day I'll be forced to cold turkey (especially at these doses) unless I taper quickly. The good news is that you are taking (10mg) about 1/4th of what some folks are prescribed in Xanax or Klonopin on a regular basis.
So how gradual? I dare say that because of the half-life of Zolpidem that you don't need to follow the strict 10-15% rule. But that's just an opinion and it certainly would not hurt to taper as slowly as you want, as long as there is some steady downward progression. Personally, I can feel the effects of as little as 2.5mg, but not under that. Although I am going to try a Valium taper (unless doctors will not cooperate), I probably could just as easily taper 2.5mg a week, if I could cut it that small. I am going down about 5mg per week.