Strange & Weird

Okay so ladies, I come on here to ask for advice, and to see if my story can relate to anyone. ok well my husband and I have been together for 7 years, and just recently, this really weird thing is happening with my husband. We will lay down to go to sleep and a couple hours go by and he will wake up to his boxers being completely soaked, the bed will be soaked, but when I smell, it doesn't smell like pee or nor is our bed stained yellow. it is just really weird because this recently just started happening. I'm worried about him because like I said this is new and when I say soaked I mean it, I just had to grab a towel just so I could not lay in a wet spot. At first I thought maybe a wet dream, then I was like no that is way to much liquid to be a wet dream. Has this ever happened with anyone's husband, boyfriend or anybody they know? Please help I'm worried