DSIP (Delta Sleep-Inducing Peptide): The Enigmatic Nonapeptide

A research-focused analysis of Delta Sleep-Inducing Peptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu), its role in sleep regulation, stress response modulation, and its unique position as the only known neuropeptide that crosses the blood-brain barrier efficiently.