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sleep-related erections

The natural periodic cycle of penile erections that occur during sleep, typically associated with REM sleep. Sleep-related erectile activity can be characterized by four phases: T-up (ascending tumescence), T-max (plateau maximal tumescence), T-down (detumescence), and T-zero (no tumescence). Polysomnographic assessment of sleep-related erections is useful for differentiating organic from nonorganic erectile dysfunction.
Credit

Definition reprinted with permission from Culebras, Antonio, Clinical Handbook of Sleep Disorders, Butterworth-Heinemann