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Men without physiological erectile dysfunction or severe depression [2] experience nocturnal penile tumescence, usually three to five times during a period of sleep, typically during rapid eye movement sleep. [3] Nocturnal penile tumescence is believed to contribute to penile health. [4]
The postage stamp test is a test used to evaluate nocturnal erections in a workup of male impotence. [1] [2] A length of connected postage stamps connected by perforations that allow easy tearing are secured loosely around the male's flaccid penis just prior to sleeping.
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal, sexual attraction or libido, although erections can also be spontaneous.
Tumescence usually refers to the normal engorgement with blood [1] (vascular congestion) of the erectile tissues, marking sexual excitation, and possible readiness for sexual activity. The tumescent sexual organ in males is the penis and in females is the clitoris and other parts of the genitalia like the vestibular bulbs .
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A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.