Eight hours. This number is spoken like gospel in this country when it comes to sleep. "How much sleep do I need?" Eight hours. "How can I feel like the people in Old Navy ads?" Get eight hours. "Why did that Spanish nun ruin that fresco?" She wasn't sleeping eight hours.
Those who claim they "get by" on very little sleep are likely fooling themselves, but their bodies won't fool them for too long. Eventually, that lack of sleep will show up somewhere in the way they look or feel (or both).