I had the same issue, sweating a night.
During the daytime, I didn't sweat, not even during my weekly fittnes hour.
Now, after CCSVI treatment, it's the other way around. No sweat at night, but I sweat when doing my exercises and when it's hot.
My heat tolerance is much better now.
So, I think there must be a logical connection between the angioplasty and the sweating.
I'm telling everybody my internal air-conditioner is repaired. The cooling-agent (the blood, in my case) can flow again..
I'm ready, I'm ready !