The Russian sleep deprivation experiment is an urban legend that never happened. Here is a genuine article on sleep deprivation. Pretty interesting stuff. Nobody knows why we have to sleep. They just know if you don't you will die.
http://ngm.nationalgeographic.com/2010/05/sleep/max-text
Sleep is so important to brain regeneration. Did you know that when you sleep your brain processes all you have done during the day and then goes through it all again backwards? Filtering out what should be saved? What an incredible creation is this biological wonder. No one in their right mind could possible accept this as a product of chance. Maybe if you were sleep deprived.