Nocturnal penile tumescence

morning erectionnocturnal erectionmorning erectionsmorning woodpenile erections during sleep
Nocturnal penile tumescence is a spontaneous erection of the penis during sleep or when waking up.wikipedia
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Erection

erectpenile erectionerect penis
Nocturnal penile tumescence is a spontaneous erection of the penis during sleep or when waking up.
Erections during sleep or upon waking up are known as nocturnal penile tumescence (NPT).

Human penis

penispenisesdick
Nocturnal penile tumescence is a spontaneous erection of the penis during sleep or when waking up.
(See nocturnal penile tumescence.) The primary physiological mechanism that brings about erection is the autonomic dilation of arteries supplying blood to the penis, which allows more blood to fill the three spongy erectile tissue chambers in the penis, causing it to lengthen and stiffen.

Sleep

sleepingsleep architectureasleep
Nocturnal penile tumescence is a spontaneous erection of the penis during sleep or when waking up.
Counterintuitively, penile erections during sleep are not more frequent during sexual dreams than during other dreams.

Nocturnal clitoral tumescence

Along with nocturnal clitoral tumescence, it is also known as sleep-related erection.
Similar to the process in males, nocturnal penile tumescence, females experience clitoris tumescence or engorgement of the vagina mainly during REM sleep phase.

Rapid eye movement sleep

REM sleepREMrapid eye movement
All men without physiological erectile dysfunction experience nocturnal penile tumescence, usually three to five times during a period of sleep, typically during rapid eye movement sleep.
Erections of the penis (nocturnal penile tumescence or NPT) normally accompany REM sleep in rats and humans.

Erectile dysfunction

impotenceimpotentimpotency
All men without physiological erectile dysfunction experience nocturnal penile tumescence, usually three to five times during a period of sleep, typically during rapid eye movement sleep.
Obtaining full erections occasionally, such as nocturnal penile tumescence when asleep (that is, when the mind and psychological issues, if any, are less present), tends to suggest that the physical structures are functionally working.

Tumescence

detumescencetumescentflaccid
The existence and predictability of nocturnal tumescence is used by sexual health practitioners to ascertain whether a given case of erectile dysfunction is psychological or physiological in origin.

Reproductive health

sexual healthsexual and reproductive healthsexual
The existence and predictability of nocturnal tumescence is used by sexual health practitioners to ascertain whether a given case of erectile dysfunction is psychological or physiological in origin.

Psychology

psychologicalpsychologistpsychologists
The existence and predictability of nocturnal tumescence is used by sexual health practitioners to ascertain whether a given case of erectile dysfunction is psychological or physiological in origin.

Physiology

physiologistphysiologicalphysiologically
The existence and predictability of nocturnal tumescence is used by sexual health practitioners to ascertain whether a given case of erectile dysfunction is psychological or physiological in origin.

Somatic symptom disorder

somatoform disordersomaticpsychosomatic illness
If nocturnal tumescence is detected, then the erectile dysfunction is presumed to be due to a psychosomatic illness such as sexual anxiety; if not, then it is presumed to be due to a physiological cause.

Norepinephrine

noradrenalinenoradrenergicnoradrenalin
Bancroft (2005) hypothesizes that the noradrenergic neurons of the locus ceruleus are inhibitory to penile erection, and that the cessation of their discharge that occurs during rapid eye movement sleep may allow testosterone-related excitatory actions to manifest as nocturnal penile tumescence.

Locus coeruleus

locus ceruleuslocus coereuleuslocus coeruleus-noradrenergic system
Bancroft (2005) hypothesizes that the noradrenergic neurons of the locus ceruleus are inhibitory to penile erection, and that the cessation of their discharge that occurs during rapid eye movement sleep may allow testosterone-related excitatory actions to manifest as nocturnal penile tumescence.

Neuron

neuronsnerve cellsnerve cell
Bancroft (2005) hypothesizes that the noradrenergic neurons of the locus ceruleus are inhibitory to penile erection, and that the cessation of their discharge that occurs during rapid eye movement sleep may allow testosterone-related excitatory actions to manifest as nocturnal penile tumescence.

Testosterone

low testosterone levels due to agingmetabolismprenatal exposure to androgens
Bancroft (2005) hypothesizes that the noradrenergic neurons of the locus ceruleus are inhibitory to penile erection, and that the cessation of their discharge that occurs during rapid eye movement sleep may allow testosterone-related excitatory actions to manifest as nocturnal penile tumescence.

Urinary bladder

bladderfundusintravesical
Evidence supporting the possibility that a full bladder can stimulate an erection has existed for some time and is characterized as a 'reflex erection'.

Spinal nerve

spinal nervescervical nervessacral nerves
The nerves that control a man’s ability to have a reflex erection are located in the sacral nerves (S2-S4) of the spinal cord.

Spinal cord

medulla spinalisspinethoracic segment
The nerves that control a man’s ability to have a reflex erection are located in the sacral nerves (S2-S4) of the spinal cord.

Nocturnal enuresis

bedwettingbed wettingbed-wetting
The possibility of a full bladder causing an erection, especially during sleep, is perhaps further supported by the beneficial physiological effect of an erection inhibiting urination, thereby helping to avoid nocturnal enuresis.

List of Beavis and Butt-Head episodes

episode of ''Beavis and Butt-headVidiotsBeavis and Butt-head Do Thanksgiving
Research into the causes of nocturnal penile tumescence was the subject of "The Mystery of Morning Wood", a 1995 episode of the animated comedy series Beavis and Butt-head.

Beavis and Butt-Head

Beavis and ButtheadBeavis & Butt-headBeavis & Butthead
Research into the causes of nocturnal penile tumescence was the subject of "The Mystery of Morning Wood", a 1995 episode of the animated comedy series Beavis and Butt-head.

Estrogen insensitivity syndrome

Complete estrogen insensitivity syndrome
He reported no history of gender identity disorder, considered himself to have strong heterosexual interests, and had normal sexual function, including morning erections and nocturnal emissions.