I too have the same symptoms and in the past Gabapentin helped calm the nerve action in my legs when I slept so that I was interrupted less during sleep, but it never stopped the pulsing, twitching and cramping completely. Still, I was getting more sleep. A very firm mattress with no top padding of any kind seemed to ease the symptoms quite a bit too and just this week I discovered that sleeping with a few pillows to change the position of my spine helped a lot. I have stopped taking Gabapentin and I’ve had 4 very good nights since doing this. I do not have these symptoms at any other time other than when I sleep and I have never had any pain, so all of my symptoms may not match yours. But maybe there’s something here that will help.