My husband masturbates in his sleeps eight to ten times a nights what is wrong ?

Abnormal masturbate: There are several possibilities. Although occasional masturbation is normal, this frequent masturbation during each night is highly abnormal. You need to make an appointment with your doctor to get your husband examined to find the cause of this abnormal behavior.

Is he sleeping?: Or is he awake? Boys and young men may have nocturnal emissions (ejaculation when asleep) but that usually ends in the late teens. It would be highly unusual for someone above that age to have nocturnal emissions but it does occur. Several episodes in a night is almost unheard of and would warrant medical evaluation.