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Show Measuring Sleep Persons differ very greatly in their mode of slumber.' Some awaken at the slightest noise, while others are only aroused with difficulty. These differences have been carefully classified classi-fied by scientists. When - scientists speak of how "fast" a person sleeps they mean how deep is his sleep. Not only Is it possible to measure sleep, but there are different means of doing do-ing so. One method is by dropping a steel ball. The ball is dropped at increasing distances four, six, eight ten, twelve inches, and so onuntil the sleeper becomes conscious of the sound and awakens. In this way scientists can find out how "deep was his sleep. Another method is to touch the sleeper with an electric wire, noting the intensity of the current cur-rent used. |