I am also taking Gabapentin for RSD/CRPS, basically nerve pain. I was on 300 mg a day for about 1 month to start. It helped the pain, but yes I had those wonderful sleepy periods out of nowhere and then sleeplessness. I had to up the dose because the pain was getting worse and slowly over about 1 week I went from 300 mg a day to 900 mg a day. Its been about 1 month now that I have been on 900 mg a day and find that it take about that time for my body to adjust to the dose, but it does get better. I tried Lyrica, but too many side effects, dizzinezz, spinning, swelling, so I was taken off. Also the Gabapentin at first made me very clumsy. I fell three to four times within the first 3 days of starting it and then again when I increased my dose. But again, this decreased and then completely got better after my body adjusted. So my suggestion is to gradually increase the dose and keep taking the higher dose, hopefully you will adjust as your body get use to the higher dose, but you will have to get through this to get leveled out. Best of luck.