Hours of sleep: hacking yourself

Yeah, it's possible ... I was thinking that I must sleep about 8 hours a day ... Then I slowly began to stay about half an hour longer awake ... Then the next week about an hour longer awake ... After a few weeks, I managed to work normally with about 4 hours of sleep ... For about 3 months I only slept 4 hours a day ... It's possible, You just need to get used to ...