sleep quiz

Are naps a necessary part of a person's life? For my life, they seem totally necessary. But others may disagree. They help me stay awake while I drive, take walks, pet kittens. I've heard various doctors say people should be getting 7 to 10 hours of sleep a night. But my question is, what if these hours are divided into smaller sections of sleep-time (like, 6 and 2 hours, which, if my math is correct, will still equal 8)? How many naps per week are considered too much? How many in a day?