Why? Work and play are meaningless terms given the current nature of how humans live. Work should be fun and play can be hard. So what's the real difference? You need time to do important things that take detailed planning and you need time to do impromptu things that just occur. Both types of things can be traditionally classified as "work" or "play". Even things that might seem just recreational can be income gnerating so the lines bl;ur. I think it's far better to acept the complex nature and find ways to enjoy my work and get through the hard parts of playing.