What is it about that 'end turn' button which means you just have to press it again? Last time you glanced up at the clock it was 10pm, then 1am, then 3am, quick kebab break, then 6:35am, and by this point you're not sure whether you're still playing a game or whether you really are the leader of a civilization bent on world domination. Your arms ache, your coffee has gone cold again without you noticing, and sunlight is streaming through your blinds...