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It is normal for a man to have five to six erections during sleep, especially during rapid eye movement (REM). Their absence may indicate a problem with nerve function or blood supply in the penis. There are two methods for measuring changes in penile rigidity and circumference during nocturnal erection: snap gauge and strain gauge. A significant proportion of men who have no sexual dysfunction nonetheless do not have regular nocturnal erections. Thus presence of NPT tends to signify physically functional systems, but absence of NPT may be ambiguous and not rule out either cause. A. Two extremely compact hollow cylinders, which come in a variety of widths and lengths, are implanted within the penis. A small container that holds fluid for the cylinders is inserted in the lower part of the abdomen and a pump is implanted in the scrotum. The patient squeezes the pump several times, which transfers the fluid from the container to the inflatable cylinders, which then expand, widening and lengthening the penis. To get rid of the erection, the valve at the top of the pump is squeezed and the fluid returns to the abdominal reservoir, causing penile flaccidity. buy Viagra 50mg here 100mg viagra online without prescription best drugstore where you can buy viagra 100mg viagra online without prescription Might surgery to treat impotence be necessary? Why or why not? online viagra without prescription canadian viagra for sale