This morning on the way to work, lulled by the shrieks of school children and the rattle of the number 55 tram, I fell asleep. I don’t remember having a snooze – although I’m certainly tired enough to need one – but why else would I have failed to get off at my stop, or notice that my tram had reached the end of the line, turned around and was rattling back in the direction of my home? One of the most distur...