Tell me how you’ve prevented excessive sweating

My husband, bless his heart, is the sweatiest sleeper I have ever known. I’m talking wet, need to dry my arm off with a towel if I touch his side of the bed. It smells like I soaked three gallons of vinegar into the bed. It’s stained my favorite pillowcases yellow.

He only sleeps with a top sheet (he has to have something covering him no matter what) and only wears boxers to bed. We’re not even running the heat and in the summer we keep the AC cold. I can’t live like this forever.

I’ve seen that there are different sheets that have cooling qualities, but at about $100 a set, we can’t afford to try them all. I mean normally, we wouldn’t even think of spending that much, but we’re desperate. Please tell me your secrets.