How much sleep do you “need” vs “get”? What does your sleeping schedule looks like?

We often hear many AMBITIOUS people don't sleep much. Are you one of them? If yes, Why? How do you survive on so much less sleep? Are you competing with the world by not sleeping & doing something more important than it? Particularly I'm interested in knowing at what time you sleep & wake up? Do you take naps or not? Don't you feel sleepy throughout the day? How did you compensate your sleep with weekend long sleep or drugs (nicotine,caffine etc.)? We often hear 8 HOUR sleep is mandatory? How false/true is this statement?