"Body Clocks" - Environmental and Biological Rhythms

Do you ever feel a burst of energy in the morning, but get run down by mid-afternoon? This daily ebb and flow is caused by your body's circadian rhythms. These 'body clocks' have a major impact on your consciousness as well as a wide number of physiological states. Learn more about these circadian rhythms.

Related Topics:

• Stages of Sleep
• Theories of Sleep
• More About Circadian Rhythms - From Mark Stibich, Ph.D., About.com's Guide to Longevity