This is one reason I always sleep on the floor.

Seriously, until about 1990, cotton was all we had in the military. It's what we used for survival school, and it's what we used to clean snow off jets before we flew in upstate New York.

When all you have is cotton, you take extra care to keep dry. I never wore synthetic clothes backpacking until a couple summers ago.I'll agree wet cotton can cause problems, but cotton is not inherently dangerous.

Besides, I think I'm going to get hit by a meteorite.