🌙DSIP (Delta Sleep-Inducing Peptide)
Endogenous nonapeptide that induces delta (slow-wave) sleep. Modulates stress response, reduces cortisol, normalises circadian disruptions and has potential applications in insomnia and PTSD research.
Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-GluWhat Is DSIP?
Delta Sleep-Inducing Peptide (DSIP) is an endogenous nonapeptide isolated from rabbit cerebral venous blood in 1977. It selectively promotes slow-wave (delta) sleep and modulates multiple neuroendocrine axes. It crosses the blood-brain barrier and has a broad range of research applications beyond sleep induction.
Key Mechanisms
- Delta wave promotion — selectively increases slow-wave sleep proportion without disrupting REM
- HPA axis modulation — reduces cortisol and stress response; potential PTSD research tool
- GH release stimulation — enhances pulsatile GH secretion during sleep
- Antioxidant activity — reduces lipid peroxidation and free radical damage in CNS
- Circadian rhythm normalisation — resets disrupted sleep-wake cycles
Key References
- Monnier M et al. "Dialysis of sleep and waking factors in blood of the rabbit." Science, 1977;198:175–177.
- Graf MV et al. "Delta sleep-inducing peptide — a review of its central activity." Sleep, 1984;7(4):313–329.
Frequently Asked Questions
No — research suggests it selectively promotes slow-wave (delta) sleep architecture rather than acting as a classic sedative-hypnotic, and it doesn't appear to work through the GABA-A/benzodiazepine mechanism that most sleep medications use.
Beyond sleep architecture, research has examined its effects on HPA-axis/cortisol regulation, antioxidant activity, and circadian rhythm normalisation, which is why it comes up in stress-response and PTSD research as well as sleep studies.
Like most short peptides, it should be kept refrigerated at 2–8°C after reconstitution and used within the standard 28-day window; the lyophilized powder is more stable for longer-term storage.