So, it is believed that in late 1940s, Russian scientist carried out an experiment on the prisoners to prevent them from sleeping. The main motive of this experiment was to try this experiment on the soldiers so that they can fight in the next World-war without sleeping. If this experiment was going to on first on prisoners and if it results a success, they were going to try it on soilders. They used a gas which worked to stay them awake.

 They kept five prisoners in a room where no one can move out and they can't even sleep. Every thing was going fine for the first five days. After five days the scientist found that the stopped talking to each other.

 After nine days, prisoners started screaming at the top of their lungs, it was noticed that they screamed for three hours straight. The effect of the gas was clearing being seen. It was suspected that they them self torn their vocal cords. 

 Three days passed, now they don't even speak. Researchers tried to check every hour, but they got no response on the microphones.

On the 14th day, they decided to open the chamber. 

They announced: "We are opening the chamber to test the microphones; 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." 
To their surprise they heard a single phrase in a calm voice response: "We no longer want to be freed." 

On opening the chamber, they saw four of five prisoners were still alive.

The food rations past day 5 had not been so much as touched. There were chunks of meat from the dead test subject's thighs and chest stuffed into the drain in the center of the chamber, blocking the drain and allowing 4 inches of water to accumulate on the floor. Precisely how much of the water on the floor was actually blood was never determined. All four 'surviving' prisoners also had large portions of muscle and skin torn away from their bodies. 

The two prisoners were given the same surgery, both without anesthetic as well. They were not able to feel anything.

The researchers tried asking why they had injured themselves, why they had ripped out their own guts and why they wanted to be given the gas again. 
Only one response was given: "I must remain awake." 

There made mental strength was weaken and they were actually behaving very weirdly. It is believed, all prisoners died or killed by the researchers and they never tried this type of experiment.

According to Us:

Some people still don't believe if this experiment was happened or not. I believe if the Humanity can drop Atom Bomb on Hiroshima and Nagasaki to prove their intelligence and power, so this experiment is actually very small thing in comparison to that.

We believe this experiment would have happened