Hello and thanks for your question. It s my first priority to help you. ED(erectile dysfunction) can be caused due to psychological factors such as stress, anxiety, guilt, depression, low self-esteem, poor performance and fear of sexual failure. So monitoring erections that occur during sleep can help rule out certain psychological causes of ED. Healthy men have involuntary erections during sleep. If nocturnal erections do not occur, then ED is likely to have a physical rather than psychological cause. I would recommend to concentrate on foreplay first to maintain a good erection. Also start a multivitamin supplement. You should do regular exercises to maintain a good health. You should try Cialis or Viagra for erection. Try sex in fertile phase of your wife s menstrual cycle in mid cycle to increase chances of pregnancy. Hope this helps.