"i started taking ambien cr 12.5mg for insomnia and it initially worked very well. sometime around my 4th month on it i started to unknowingly wake and take at least one (or more???) during the night. one morning i awoke to find about half my bottle of pills spilled on the floor by my bed. another time i awoke to find an empty drink glass beside my bed. apparently i had got up and mixed a drink (maybe more than one???) . . . scary stuff! no more ambien for me, ever."