The timing of human sleep is governed by the length of time since a person last slept and by their internal body clock. The body clock or circadian clock controls the timing of human sleep with a rhythm that is regulated by a region of the brain called the suprachiasmatic nucleus (SCN). The SCN, located in the hypothalamus, sends signals to help us stay awake and counteract the effects of fatigue. These signals peak in the evening, when the drive for sleep is high, and then diminish when bedtime approaches.
In most people, the sleep/wake circadian rhythm is maintained on a 24-hour day cycle and determined by the light exposure they get in the morning or evening. When a person's body clock is mismatched with their sleeping and waking schedule, it may create a circadian rhythm sleep disorder.
About the American Council of the Blind
The American Council of the Blind (ACB) is a national organization of blind, visually impaired and sighted individuals whose purpose is to work toward independence, security, equality of opportunity, and improved quality of life for all blind and visually impaired people. ACB programs and services include "The Braille Forum", a free monthly publication available in Braille, large print, on cassette and computer disk, and by e-mail subscription and at www.acb.org; numerous scholarship awards; and active participation in the national legislative and advocacy scene. ACB is also a valuable resource for information on programs and services in the blindness field and laws affecting blind persons.
About Vanda Pharmaceuticals Inc.
Vanda Pharmaceuticals Inc. is a biopharmaceutical company focused on the development and commercialization of clinical-stage products for central nervous system disorders. For more on Vanda, please visit http://www.vandapharma.com/.
|SOURCE Vanda Pharmaceuticals|
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