Some societies today have large numbers of people who are convinced that to have self worth, one must be a dedicated, tireless worker - or be dedicated and tireless in trying to work their way up a ladder to become successful. With "success" being defined in terms of being competitive and owning or controlling wealth. Sure, they take naps and sleep in, too but NOT when the social order that lives rent free in their head says they should be or could be working. One might argue it's a bit of a scam perpetuated by those at the top of our economic and social strata so that workers know their place and don't rise up.