Skip to main content Accessibility help

We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.

Close cookie message
×
  1. Home
  2. Search

Refine search

Refine search

Access:
Content type:
Publication date:
Apply   From and To filters
Subject: Show more
Journals Show more
Publishers: Show more
Societies Show more
Series: Show more
Collections: Show more

Actions for selected content:

Select all | Deselect all
  • View selected items
  • Export citations
  • Download PDF (zip)
  • Save to Kindle
  • Save to Dropbox
  • Save to Google Drive

Save Search

You can save your searches here and later view and run them again in "My saved searches".

Please provide a title, maximum of 40 characters.
Cancel
×

1 results

  • Chapter 30 - Genetic disorders and sleepiness

  • from Section 3 - Medical, Psychiatric and Neurological Causes Of Sleepiness
  • Edited by Michael J. Thorpy, Michel Billiard
  • Book:
    Sleepiness
    Published online:
    04 February 2011
    Print publication:
    27 January 2011, pp 335-350

  • Summary

    In this chapter, travel fatigue and jet lag are treated as a subjective assessment that is synonymous with fatigue and lack of alertness. The symptoms of travel fatigue include a general weariness, and travellers often nap during the journey. The circadian rhythms tend to fall into two groups: those that peak during the daytime and are associated with the active phase of the individual; and those that peak during nocturnal sleep and are associated with fasting and recuperation. The suprachiasmatic nuclei (SCN), paired groups of cells in the base of the hypothalamus, are the site of the body clock in mammals. The body clock transmits its rhythmic output to regions of the brain controlling temperature regulation, hormone release, feeding and sleep. Measured circadian rhythms are combined effects from a body clock (endogenous component) and the environment (exogenous component) that are normally in synchrony.