The Russian Sleep Experiment

Toward the end of the 1940s, Soviet researchers sealed five prison inmates in an airtight chamber and dosed them with an experimental stimulant gas to test the effects of prolonged sleep deprivation. Their behavior was observed via two-way mirrors and their conversations monitored electronically. They were promised their freedom if they could go without sleep for 30 days.
On the ninth day the screaming began. First one subject, then another, was observed running around the chamber screaming for hours on end. Equally disconcerting was the behavior of the quieter subjects, who began ripping apart the books they'd been given to read, smearing the pages with feces and plastering them over the mirrored windows so their actions could no longer be observed.
Then, just as suddenly, the screaming stopped. The subjects ceased communicating altogether. Three days passed without a sound from inside the chamber. Fearing the worst, the researchers addressed them via the intercom. “We are opening the chamber to test the microphones," they said. "Step away from the door and lie flat on the floor or you will be shot. Compliance will earn one of you your immediate freedom."

A voice from inside answered, “We no longer want to be freed."

THE BIGGEST TRUTH IS:-

NO SUCH EXPERIMENT TOOK PLACE
While the premise that keeping a group of people awake for 15 days straight would end in a cannibalistic bloodbath makes for a gripping fictional horror story, it's not borne out by scientific evidence. The so-called Russian Sleep Experiment never took place.