Night Sweats

Has anyone got any idea on how I can reduce or completely get rid of night sweats?

I have woken up every night for maybe two weeks now to an excess amount of sweat. My mattress is soaked, so is my pillow. I wake up usually at around 4am to the sweat and switch beds after.

And yes I have tried everything from opening the windows, to getting a fan right next to my bed, but nothing seems to work.

If anyone's got any idea, pls let me know.