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. (It should be noted that 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.)
The electrodes and the recorder are used by the patient to monitor nocturnal tumescence for up to three nights. The host interface and the computer program are used to prepare (initialize) the recorder for use and to download the data from the recorder for display and analysis on a physician’s computer.
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