DSIP: Delta Sleep-Inducing Peptide
Nine-amino-acid peptide first isolated in 1977 from rabbit cerebral venous blood during delta sleep. Modest human trial evidence for sleep and stress modulation.
👥 Human studies
- Full name
- Delta sleep-inducing peptide (DSIP)
- Class
- Nonapeptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu)
- Half-life
- Short (~minutes)
- Route
- IV or subcutaneous in research
- Developer
- Schoenenberger/Monnier (academic, 1970s)
- Regulatory status
- No regulatory approval
What it is
DSIP was discovered by Schoenenberger and Monnier in the 1970s from dialysates of sleeping rabbits. Despite the name, it is not uniquely hypnotic; modern evidence characterises it more broadly as a neuromodulator affecting sleep architecture, stress response, and opioid systems.
How it works
The exact receptor for DSIP remains uncharacterised. Rodent studies show it modulates hypothalamic CRH and vasopressin, and may influence serotonergic and opioid neurotransmission.
Clinical effects in small human trials include reduced sleep onset latency, improved subjective sleep quality, and attenuated cortisol responses to stress.
What the research shows
Evidence base consists of small human studies from the 1980s–1990s and subsequent pre-clinical work.
Schneider-Helmert D (1985) — chronic insomnia
Schneider-Helmert D. et al., Neuropsychobiology 1985;13:107–111. 👥 Human studies
16 patients with chronic insomnia received DSIP IV for several nights.
Sleep efficiency and subjective quality improved; no tolerance or rebound was observed on discontinuation.
Limitations: Small, open-label; short duration.
Kästner P. et al. (1987) — alcohol withdrawal
Kästner P. et al., Alcohol Alcohol 1987;22:213–218. 👥 Human studies
DSIP administered during alcohol withdrawal reduced symptom scores and improved sleep.
Effects were interpreted as modulation of stress-axis hyperactivity.
Limitations: Small cohort; older methodology.
Safety and limitations
Historical human trials reported minimal side effects; DSIP does not produce sedation in the classic benzodiazepine sense. No large modern safety datasets exist.
Grey-market preparations vary in purity; claims of “natural” sleep induction are not supported by current evidence.