Phosphorylated delta sleep inducing peptide restores spatial memory and p CREB expression by improving sleep architecture at high altitude ScienceDirect Human Delta Sleep Inducing Peptide (dSIP) ELISA Kit (HUDL00881) DSIP Therapy Kit MedClub by Dr Jenn DSIP (Delta Sleep Inducing Peptide) is a synthetic nonapeptide originally isolated and studied for its association with neuroregulatory signaling systems. It is evaluated in controlled research environments for its interaction with central nervous DSIP: The Sleep Peptide That Changes How Canadians Rest