My doctor gave me this medicine because of my muscle spasms. It was working great; then I started noticing for the past couple of weeks that I'm not sleeping at night. I'm up from 11 pm until about 4 or 5 in the morning. I take my medicine at around 6 pm, and I start getting sleepy at about 8pm. We'll go to bed at 9 pm, and I'll lay there and toss and turn until I get up from the bed and go into the living room and I don't get sleepy at all. I don't know what else to do. Except that I'm going to quit taking it. I need sleep.