I get the aliens too. Not as often though. Actually right now the cramps are pretty calm everywhere. Hope I'm not jinxing myself by saying it!
I'll agree the neck ones are the worst. The leg cramps must have been my first official "symptom" but I was clueless that they meant anything. I'd fly for "X" amount of hours overnight overseas, get into my hotel room lay down, only to be awakened by monster charlie horses. I'd be up and down for the entire 4 hours I'd allow myself to sleep (because of the whole jet lag deal) walking around the room trying to get the cramps to let up, only to have them set in once I fell asleep again. Even before we would land, I'd start getting them in my feet when I was up in the aisles, but I thought it was because my feet were cold.