World Library  
Flag as Inappropriate
Email this Article

Nocturnal penile tumescence

Article Id: WHEBN0007276195
Reproduction Date:

Title: Nocturnal penile tumescence  
Author: World Heritage Encyclopedia
Language: English
Subject: Sleep, Erection, Rapid eye movement sleep, Nocturnal emission, Morning wood
Collection: Andrology, Penile Erection, Sleep
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Nocturnal penile tumescence

Nocturnal penile tumescence (abbreviated as NPT), also known colloquially as morning wood, is a spontaneous erection of the penis during sleep or when waking up. All men without physiological erectile dysfunction experience nocturnal penile tumescence, usually three to five times during the night, typically during REM sleep.[1] NPTs are believed to contribute to penile health.[2]

Contents

  • Diagnostic value 1
  • Mechanism 2
  • In popular culture 3
  • See also 4
  • References 5

Diagnostic value

The existence and predictability of nocturnal tumescence is used by sexual health practitioners to ascertain whether a given case of erectile dysfunction (E.D.) is psychological or physiological in origin. A patient presenting E.D. is fitted with an elastic device to wear around their penis during sleep; the device detects changes in girth and relays the information to a computer for later analysis. If nocturnal tumescence is detected, then the E.D. 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.[1]

Mechanism

The cause of NPT is not known with certainty. 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 REM sleep may allow testosterone-related excitatory actions to manifest as NPT.[3]

Evidence supporting the possibility that a full bladder can stimulate an erection has existed for some time and is characterized as a 'reflex erection'. 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.[4] A full bladder is known to mildly stimulate nerves in the same region.

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.

In popular culture

Research into the causes of NPT was the subject of "The Mystery of Morning Wood", a 1995 episode of the animated comedy series Beavis and Butt-head.

See also

References

  1. ^ a b "Tests for Erection Problems".  
  2. ^ Why guys rise and, well, rise in the morning?, The Body Odd, NBC News, October 2010
  3. ^ Bancroft, J (2005). "The endocrinology of sexual arousal".  
  4. ^ Phil Klebine; Linda Lindsey (May 2007). "Sexual Function for Men with Spinal Cord Injury". Spinal Cord Injury Information Network.  
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.