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Scientists assumed that the brain was more or less “turned off” during sleep. In 1929, the invention of the electroencephalogram (EEG) enabled scientists to record the brain waves of sleeping people. What scientists found was amazing: not only does the brain not shut down during sleep, but it is extremely active at certain points. The next question was, why? What are sleeping people thinking about? The modern field of sleep study set out to find the answers.

The electroencephalogram (EEG) allows scientists to record the brain waves of sleeping people.

Teen Guides to Health & Wellness: Sleep and Hygiene

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