The DSIP or the Delta sleep-inducing Peptide is a somnogeneric nonapeptide that impacts the neuromodulation. It is typically found in the brain and passes by the blood barriers quite quickly. Studies have shown that DSIP and as well as its analogs are classified as peptide neuromodulators. 
Studies have also shown that DSIP has exhibited a stress-protective action that helps decrease stress metabolic disorders for humans and animals.
It is believed that the Delta Sleep-Inducing Peptide works in such a way that it modulates the activity of GABAergic gluta and other neuronal systems as well