I've had this problem for years also and don't know why!
But; if you own or ever read a medical book or talked to a Dr.,
you'll see that almost every single damn health problem from
minor to fatal has the symptom of night sweats! I learned to just
deal with it! Im not over weight, but hey it's the fat n salt water
coming out; unless you have a serious disease, I would'nt stress
over it all too much!!! :d