i am 38 year, wheneve i woke up from sleep will have strong erection, but if i try to have sex with my wife within a munite it will just weak, i realy need help
You have, what is called as Secondary Genital Response Failure (Erectile Dysfunction). You need to meet a mental health professional (psychiatrist, clinical psychologist, counselor etc.) and figure what is causing the weaker erections and seek suitable treatment.