Sleep and Dementia By James W. Kozelka

The timing of sleep (known as circadian rhythm) is under the control of the hypothalamus (a part of the brain about the size of a dime directly behind the eyes and above the pituitary). The most important input to this “biological clock” is light information from the retina. In newborn infants our biological clock has not yet been set and the pattern of sleep is somewhat random (known as irregular circadian rhythm). Over the first several weeks of life light input from the retina eventually sets the biological clock and…

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