hi helen i have a older and younger brother and both stopped wettingthe bed at 3ish years old, i wet the bed until i was 18 then stopped, but since last year i started wetting again i also dribble in my underwear if i cant reach a toilet in time, when i approched my doctor(very embarasing) and he did tests etc.. everyhing was normal, the reason i wet is because i was only 2lbs when was born and iam only 5'3" now, i have an under developed bladder & bowel, the reason iam saying this is there could be loads of reasons why your husband wets the bed, the is someone i know has allergys which makes her wet the bed. hope this helps.