What methodological breakthrough for the study of sleep came in 1937?

Question

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Electroencephalography (EEG) was first used in 1937 to study sleep, providing a breakthrough in the ability to measure brain activity during different stages of sleep. EEG recordings allowed researchers to identify different stages of sleep and study the patterns of electrical activity in the brain during these different stages. This breakthrough greatly expanded our understanding of the changes that occur during sleep and laid the foundation for further research in the field. The other options (B, C, and D) are not directly related to the study of sleep and do not represent a significant methodological breakthrough in this area.

What Methodological Breakthrough for the Study of Sleep Came in 1937