Contrary to long established belief, the ability of most persons to work more swiftly and accurately on rising from a night’s sleep is not as great as it may be at other times. This was one of the many surprising facts discovered during a series of sleep tests conducted by Dr. Nathaniel Kleitman of the University of Chicago in 1934. In his experiments he used the electrical recording instruments shown above. With them, he charted the effects upon sleepers of alcohol and drugs.
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