Barehard, this is one of the more quizzical changes I've noticed since going paleo. I quit smoking at the same time, so I figured it was withdrawl symptoms. However, it's been 3 months and I have absolutely no nicotine cravings.
As for my experience with nighttime sweats, it's pretty intense. I'll wake up in the middle of the night with my skin and covers ABSOLUTELY drenched. It started in January, when I started eating Paleo/quitting smoking, then it stopped for almost a month, and just a few nights ago, it started again.
What do you think it could be? I haven't really had any separation problems with grains or dairy. I think I'm going to start logging the nights it happens and see if there's a pattern.