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Nothing. It is the first letter in the Greek Alphabet. It is correct that alpha is the first letter in the Greek Alphabet. For some reason, people doing research on sleep have defined the activity of the alert, awake brain as "beta waves". Then when in a relaxed or dreaming state, the brain produces "alpha waves". Deeper sleep is characterized by theta waves, and the deepest sleep produces delta waves. So from this perspective, beta comes before alpha. But be ready to explain, because people will think you are wrong.

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Q: What comes before Alpha?
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