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The Delta Sleep-Inducing Peptide is a naturally occurring 14-amino acid peptide found in the brain and central nervous system of humans and other mammals. It was first discovered in 1977 by Swiss scientists who were studying the brain waves of sleeping rabbits. They noticed that a specific substance extracted from the brain tissue of sleep-deprived rabbits induced “delta waves” (slow-wave, deep sleep) when injected into other rabbits.