"Normal" in the context of the body's actual sleep needs, not "normal" in the sense that everyone has the time or life management skills to achieve those needs.

"Normal" in the context of the body's actual sleep needs, not "normal" in the sense that everyone has the time or life management skills to achieve those needs. ("Normal" also depends on age: babies sleep a lot more than 8 hours a day, teenagers also typically need more sleep than they actually get.)