I have been suffering from night sweats too, it started towards the peak of my recent flair up, I know what you're going through it's so uncomforatable, I was sleeping on towels and sweating through 4 or 5 t-shirts a night, they've been going for about three to four weeks ... I've been on Pred for 8 days now, just dropped my dose from 40 mgs a day, to 30 mgs a day yesterday, and last night was my first sweat free night.
I hope this is the end of it, fingers crossed. I'm sure it is related to the UC flair, because I've never had nightsweats before (except when I've had like flu or something) and I'm a boy so, clearly, it's not related to menopause or anything.
I hope yours stop soon, I feel for you.