hello...thanks for the query. Yes your concerns as well as suspicions are correct. At 40 years age, one does not suddenly starts wetting bed. There can be few causes to this behaviour. First, does he drinks too much alcohol on a regular basis or consumes any intxicating drug before sleeping at night? Becasue intoxicated state can be the simple explanation for inability to get up to pass urine at night. Secondly if this has been a long standing behaviour as per you, has he suffered any traumatic experience? Does he suffers from frequent nightmares? This bd wetting may be due to re-experiencing stressful experiences which occurs in reaction to severe stress/post traumatic stress disorder. In any case, evaluation by a doctor preferably a Psychiatrist will be certainly helpful. Good luck