I take 1/2 to 1 zopiclone a couple of times a week. everyone once in a while, like tonight, I take one and have no effect within 2.5 hours, I keep waiting for my typing to get slow and full of mistakes, to lose my games on facebook, and can't keep my eyes open, and it doesn't happen. I just took a 2nd one. why don't they work oaccaisionally? Sugar pills in the mix?