The human sleep evidence

What the actual human sleep studies show, and how small they are

This is the unit that decides whether DSIP "works" for sleep, and the honest answer is: we do not really know. The supportive human data is a short series of small studies from one investigator, Schneider-Helmert, none with more than eighteen patients where FDA gives a size. Two independent groups ran similarly designed double-blind trials and did not reach the same conclusions, and later findings, on the body’s own DSIP and under anaesthesia, cut against the simple story.

You will appraise each study by modern standards, meet the independent attempts that did not confirm a useful benefit and the paradox findings that complicate everything, and learn where "normalisation", the positive investigators’ own word for what they reported, comes from.