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Tonic Functions - occur throughout REM sleep - include:
Phasic Functions - occur periodically during REM sleep - include:
Hormones released by pituitary gland: (1)
An average, healthy person's body temperature starts to decrease at about eleven PM. It then reaches its lowest at about 4 AM. It continues to rise during the morning. After a slight mid-afternoon dip, the temperature will rise to it's highest during the early evening. The range in body temperature throughout the day is typically about 1.1 degrees Celsius (2 degrees Fahrenheit).*
During the night, humans have less concentration. Our ability to estimate time becomes worse. Accuracy in simple arithmetic deteriorates. Our arithmetic becomes worse. It even becomes harder for us to do simple, repetitive tasks. The lowest point of these disabilities occurs around 3:00 AM. (2)
All of these functions are synchronized in Circadian Rhythms to our biological clock.
(1) Morin MD, Charles M. Relief from Insomnia: Getting the Sleep of Your Dreams. New York: Doubleday Maintreet Books. 1996.
(2) Coleman, Richard M. Wide awake at 3:00 A.M. By Choice or by Chance? New York: Freeman and Co., 1986. 195 p.
*Original Graphic by Gerry Wyder.[an error occurred while processing this directive]