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Because sleep is a universal human experience, it has probably interested people since the dawn of humanity; however, scientific inquiry into sleep is a relatively recent phenomenon. Early interest in sleep arose during the late nineteenth century from a need to isolate the brain structure responsible for lethargy syndromes. Similarly, the electrophysiological study of sleep originated with a discovery in 1875 by the English physiologist Richard Caton that the brain continually produces low-voltage waves. This discovery was largely ignored until 1929, when a German psychiatrist, Hans Berger, found that he could record from large groups of neurons by attaching electrodes to the scalp and the forehead. Berger's discovery marked the beginning of modern electroencephalography. With the advent of EEG recordings, it was not long before A. L. Loomis, E. N. Harvey, and G. A. Hobart found, in 1937, that EEG recordings could be used to differentiate stages of sleep. In 1952, Nathaniel Kleitman at the University of Chicago gave Eugene Aserinsky, one of his new graduate students, the assignment of watching the eye movements of sleeping subjects. Aserinsky quickly noted the rapid, darting nature of eye movements during certain times of the night, which differed from the usual slow, rolling eye movements observed at other times. William Dement later coined the term "REM sleep"; sleep in which slow, rolling eye movements predominate later came to be known as NREM sleep (for nonrapid eye movement sleep). Finally, in 1957, Dement and Kleitman presented the current system of four NREM sleep stages and stage one-REM sleep.

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Natural Cures For Insomnia

Natural Cures For Insomnia

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