An Experimental Study of Sleep

Boris Sidis published this 1909 monograph after rigorous experimental work at Harvard Medical School's Physiological Laboratory — systematic studies on puppies, frogs, guinea pigs, cats, and human subjects to map the stages and mechanisms of sleep, the effects of drugs, the role of dreams, and the cognitive impact of deprivation. For a history-of-science reader, it is a valuable primary document: Sidis was a serious Harvard-affiliated researcher, and the multi-species methodology was genuinely rigorous by early twentieth-century standards. The honest caveats are unavoidable: over a century of sleep neuroscience has superseded virtually every specific finding here, the animal experimentation methods reflect ethical norms now considered outdated, and the text is technical and dry. Modern reprints are widely available and free via the Internet Archive. Worth reading as a historical artifact; not worth reading as a guide to sleep.