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Human Sleep Studies A small number of controlled human studies have been conducted using intravenous DSIP administration[8]: A double-blind crossover study in 6 healthy volunteers reported a 59% increase in total sleep time within 130 minutes of intravenous administration at 25 nmol/kg Delayed effects included shortened sleep onset and improved sleep efficiency in subsequent nights A separate double-blind study in 16 chronic insomnia patients showed statistically significant but weak improvements in sleep efficiency and latency compared to placebo The insomnia study authors concluded short-term DSIP was “not likely to be of major therapeutic benefit” given the marginal effect sizes These represent limited human data and do not constitute clinical trial evidence meeting modern standards