About half of the nights over the last two weeks I have woken up in the middle of the night with sweat on me. Not a fever, or 90F degree day kind of sweat, but certainly a damp, uncomfortable situation.
The first few nights post ultra I am sure it had to do directly with my recovery. White blood cells working to rebuild me and my blood trying furiously to flush out the free radicals. One night in particular it was especially damp when I woke up. However as time goes on this is becomming less of an issue, unless I exercise moderately hard. In that case, the cool damp skin returns.
Not sure exactly why this happens. Certainly it is a biological response to exercise, but is it thyroid, blood, muscles, metabolism, or all of the above? Regardless, definitely not my favorite part of hard exercise.