Seeing a doctor and discussing your sexual habits with him will help your doctor determine the problem. The problem can either be mental or physical. To determine which of these problems it is, the patient is sometimes fitted with a penis sensor while he sleeps. Men get around 4-8 erections while they sleep usually during the REM cycle. If a man does not achieve an erection during sleep, then the problem is physical. If the man does get erections during the night, it is mental.
If the problem is physical, that means there is poor blood flow. To solve that, you need to open the arteries. Sildenafil citrate is taken to help do this. The nitric oxide enters the penis and relaxes the smooth muscle allowing blood to enter freely.
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