I have moved all of us onto Baavet woollen duvets, absolute game changer.
DH suffers terribly from night sweats, I'm the opposite and am ice maiden at night, we're a veritable Jack S pratt and his wife. We were about to get two separate duvets when we saw Baavet at an agricultural show. They explained how well worked and have us a demo.
Honestly haven't looked back, I am allergic to wool and cannot wear anything with even 1% would but an absolutely fine.
DCs have asthma and one has really severe and varied allergies, including dust mites. They've been much better since we moved them onto wool, apparently the mites can't live in the wool.
To clean you hang outside on a sunny day (after seeing what magic the sun can perform on makes I believe this helps), and you can spot clean or at a pinch fully wash the duvet gently.
I now pine for a matching mattress, but no way can afford at the moment
Have a go, they offer a 30 day returns policy if you don't get on