The evidence is that naps are good for us. And they have deeper meaning as a remnant of ancient "polyphasic sleep." Our most ancestral ancestors had more periods of sleep each day than meals. But modernity and industrialization have rendered sleep monophasic for most of us. Nobody is going to pay you for sleeping. I would become more of a crunchy con if this sleep deprival issue were taken more seriously than how dinner was raised.
CHRONOBIOLOGY UPDATE: Sleep deficits make you fat and lead to diabetes and hypertension. Parents: Make your kids turn off those TVs and computers, and let them sleep longer on weekends. And of course do the same yourselves. But if we all could take polyphasic naps, we could all stay up without worrying about the health consequences.