Synthesis of the Tripeptide l Trp l Ser l Glu: Comparison of its biological activity with that of the Delta Sleep Inducing Peptide (DSIP): Monnier, V.M.: 9783764309152: Books Amazon.ca DSIP You've probably seen it come up more often lately. DSIP stands for *Delta Sleep Inducing Peptide*. A peptide often used with the goal of improving sleep quality and recovery. In DSIP Uncovered A Biohacker's Guide to Restorative Sleep and High Performance Living: Transform Stress, Sleep Deeper, and Elevate Athletic Recovery (Peptide & SARMs Guides): Pierce, Gavin: 9798316057344: Amazon.com: Books Peptides Shores Dental Co. DSIP (Delta Sleep Inducing Peptide) Phoenix Pharmaceuticals, Inc.