I think my husband is cheating

I honestly have no other proof he could be cheating besides this... My husband has this thing where he sweats a lot in his sleep if he feels guilty about something. He's always been like that. He's been sweating so much in the bed the last few days I'm starting to wonder if he's actually just peeing the bed. I know him. He's been like this since he was little. His mom told me about this too. He obviously feels guilty about something because I wake up and our bed is completely drenched! I can't just ask him because what man will say "Yes I've been cheating." But there's nothing else he could be feeling guilty about.