What was studied?
Sixteen people with chronic insomnia entered a double-blind matched-pairs study over several laboratory nights. Investigators assessed sleep structure, polysomnography, subjective sleep quality and tiredness.
What did the researchers report?
Some objective measures favored DSIP, but the effects were weak and partly attributable to an incidental change in the placebo group. Most measures, including subjective sleep quality, did not change. The authors did not regard the pattern as a major therapeutic benefit.
What are the limits?
This is an old, very small study with a short observation period. Selected favorable measurements should not obscure the overall conclusion. It does not establish a current insomnia treatment, durable benefit or safety of research-supply materials.
Original editorial summary by Sulan Peptide. Based on the source abstract; consult the full paper for methods, analyses, funding and disclosures.