Hey there Montana
Montana, it is really merely a matter of judgement getting that 10% from a crushed quarter tablet. We hope to be in the ballpark when we do it. Although not exact science, it did work for me pretty well. I would crush the tab and spread out the crumbs and then try to measure the portion out.
I would also suggest that you start moving the dose away from bedtime little by little. In 15-20 minute intervals. At this point, the brain is dependent on the Xanax to sleep and needs to be retrained. My doctor had me take Melatonin 3mg for sleep. It is a natural product. Melatonin is what the brain produces to ready itself for sleep. When we use Xanax for that job, the natural Mealtonin productions totally slows down. Eventually, I did not need even the Melatonin at all and can now just fall asleep.
Best wishes in all of this!