Night Sweats

I am just curious if anyone else experiences heavy night sweats when they become physically active? I've been sweating extremely during the nights lately. My wife woke me up the other night saying how sweaty I was and to not touch her LOL. I always have a fan running too, mostly for ambient background noise. I will literally wake up and the sheets are damp. Should I be worried, or is this because my body is thermogenically ramped up now that I'm more active?