narcolepsy
"I have found this medicine to be extremely helpful, although I do have some side effects from it. I have been on Xyrem for about 4 months now. I wake up feeling better than I have in years, but I have a trembling feeling (like being very cold) on the inside of my body that lasts for about 1 hour, and my hands shake very badly for about 3 hours. Both of these side effects occur upon getting up in the morning. I will say I can tolerate the shaking, because this medicine is truly amazing."