Phosphorylated delta sleep inducing peptide restores spatial memory and p CREB expression by improving sleep architecture at high altitude ScienceDirect Frontiers Pichia pastoris secreted peptides crossing the blood brain barrier and DSIP fusion peptide efficacy in PCPA induced insomnia mouse models Delta Sleep Inducing Peptide DSIP Age Management of West Michigan Delta SleepInducing Peptide (DSIP) is a small naturally occurring peptide that was first identified in the 1970s and is associated with regulating sleep, particularly deep (delta) sleep phases. It's composed of 9 DSIP for Deep Sleep: Benefits, Dosage & Safety