DSIP and Sleep Optimization: What Has Been Studied

What the research covers

DSIP was tested for insomnia in small trials, mostly IV, in the 1980s and early 1990s, with mixed results. No human trial of DSIP under the skin was found. DSIP is a peptide of nine amino acids, isolated from rabbits and described in a 1977 paper. Put into the rabbit brain, it increased slow-wave (delta) brain waves.

A 1986 study gave 18 people with long-term insomnia six IV doses of 30 nmol/kg over one week. Sleep became normal by the end of the week in middle-aged patients. In older patients, it became normal one week later. A 1987 double-blind study gave 14 people with insomnia DSIP on 7 nights. Placebo nights came before and after. Night sleep got better from the first dose, and daytime alertness rose.

Two other double-blind trials found little benefit. In one, from 1987, patients got 25 nmol/kg IV for 4 nights. The authors judged the sleep changes of little clinical value. In the other, from 1992, 16 patients got 25 nmol/kg IV or placebo before 3 nights. The effects were weak. The authors concluded DSIP was not likely to be of major benefit.

In rabbits, DSIP given IV or under the skin increased light non-REM sleep. In cats, it mainly increased REM sleep. A PubMed search on 27 September 2026 found no human trial of DSIP under the skin. The search was DSIP AND subcutaneous AND humans[mh], which returned 2 records, neither a human trial.

Sources

1. Schneider-Helmert D Efficacy of DSIP to normalize sleep in middle-aged and elderly chronic insomniacs. Eur Neurol (1986). PMID 3792404 doi:10.1159/000116050 18 chronic insomniacs, 6 x 30 nmol/kg IV over one week; sleep normalised by end of treatment or follow-up.
2. Schneider-Helmert D Effects of delta-sleep-inducing peptide on 24-hour sleep-wake behaviour in severe chronic insomnia. Eur Neurol (1987). PMID 3622582 doi:10.1159/000116143 14 middle-aged insomniacs, double-blind, placebo-controlled, 7 nights; night sleep and daytime alertness improved.
3. Monti JM, Debellis J, Alterwain P, et al. Study of delta sleep-inducing peptide efficacy in improving sleep on short-term administration to chronic insomniacs. Int J Clin Pharmacol Res (1987). PMID 3583493 Insomniacs, 25 nmol/kg IV for 4 nights, double-blind crossover; improvement judged of little clinical significance.
4. Bes F, Hofman W, Schuur J, et al. Effects of delta sleep-inducing peptide on sleep of chronic insomniac patients. A double-blind study. Neuropsychobiology (1992). PMID 1299794 doi:10.1159/000118919 16 chronic insomniacs, 25 nmol/kg IV on 3 afternoons, double-blind; effects weak, not likely of major benefit.
5. Schoenenberger GA, Monnier M Characterization of a delta-electroencephalogram (-sleep)-inducing peptide. Proc Natl Acad Sci U S A (1977). PMID 265572 doi:10.1073/pnas.74.3.1282 Isolation from rabbits; nonapeptide that raised delta EEG activity after infusion into the brain.
6. Scherschlicht R, Aeppli L, Polc P, et al. Some pharmacological effects of delta-sleep-inducing peptide (DSIP). Eur Neurol (1984). PMID 6548967 doi:10.1159/000115712 Rabbits, cats and rodent (mouse): IV and subcutaneous DSIP raised light non-REM sleep in rabbits and REM sleep in cats.