During the 1950s, sleep researchers were able to study factors such as brain waves and muscle tension that were apparent during the sleep period. This information was recorded on individual _____, which were then analyzed.

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The Answer of During the 1950s, sleep researchers were able to study factors such as brain waves and muscle tension that were apparent during the sleep period. This information was recorded on individual _____, which were then analyzed.

During the 1950s, Sleep Researchers Were Able to Study Factors