In the 1940s, a group of Russian researchers sealed five prison inmates in an airtight chamber.
The prisoners were dosed with an experimental gas that would prevent them from sleeping. Their conversations were electronically monitored, and their behaviour was observed through secret two-way mirrors.
For the first few days, everything seemed fine. But after the fifth day, they slowly began to exhibit signs of stress. They became paranoid and stopped talking to one another, whispering about each other into the microphones.
Read more: https://www.nzherald.co.nz/world/how-the-russian-sleep-experiment-became-a-global-phenomenon/GBOQ3FWAMTJ4KZCLXGLPL4F57I/
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