My gabapentin is 400mg. I'll never get used to the vibrations because they wake me up when I do have them. It's so weird because I can lie on the bed and watch TV or movies (have big screen in bedroom) for 4 hours and not have the first vibration. They only occur AFTER I have been asleep. I have been keeping journal and rating them on scale of 1-10. I had them one night I thought one of my cats jumped on the bed and shook the bed and I woke up only to see it was me vibrating and at a level 10. I can place my hand on my side and actually feel the vibrations inside. There's got to be a common factor. People have them in different places. In their feet, their head, their chest, so many different. Mine is confined to my torso area but will move to pelvic area and every now and then be in my buttocks, especially if I wake and am on my back. Sometimes I can go back to sleep if they are a level 3 or less but anything above a 5 I have to get up before they go away. Very baffling. I'd love to be part of a clinical research about it. I told my doctor I wanted to know what was going on inside my body when I had them. Something is haywire and I just want to know. That's the reason I did the sleep study was to see if that would pick up anything. It only picked up mild sleep apnea. The heart monitor picked up nothing.