Null Results From An Orexin RCT

A team of researchers from the LessWrong community (niplav, harsimony, nomagicpill) conducted a rigorous self-blinded randomized controlled trial to test whether intranasal orexin-A could meaningfully reduce sleep requirements. The experiment involved mild sleep deprivation (5-5.5 hours instead of normal 7-7.5 hours) followed by administration of either 100μg orexin-A dissolved in saline or a placebo saline solution. Participants tracked sleep patterns using Fitbit Inspire 3 devices and completed mental acuity tests, focusing specifically on whether orexin could reduce rebound sleep needs rather than just providing temporary stimulation.

Despite careful experimental design with blocking and ecological validity, the results were exclusively null. The primary outcome measure—rebound sleep duration the night after administration—showed no statistically significant difference between orexin and placebo conditions, with effect sizes too small to be meaningful. Secondary measures including psychomotor vigilance tasks and other cognitive tests also failed to show significant differences. Interestingly, the experiment also challenged the common assumption that mild sleep deprivation substantially impairs cognitive performance, with most tests showing minimal differences between sleep-deprived and baseline conditions.