I have been taking a 10mg zolpidem every night for a little over 5yrs,about a year ago i added 2 unisom's to my nightly routine as the Zolpidem no longer worked. My question is what kind of withdraws will I experience when I stop taking them?And how long will it take for them to be out of my system comepletely the 3 no longer work as I am still only getting about 4 hrs of sleep nightly. I don't want to add another OTC sleep-aid, please help me figure this out.