My DH sweats very badly at nights, often sheets and pillowcases soaked through and I've cuddle up to him and he has been sopping wet!
We only have a 4 tog duvet even in winter, make sure the heating is not to high - our bedroom is normally between about 18 - 20 deg C, and his a little overweight but not excessively so!
Do you think I should ask him to see a GP? It has been going on for years.