Lots of us are up at all sorts of hours. Our days get turned topsy-turvy because, since we now all work all day as we can work anywhere, we get a call from a colleague on another continent at 3 am (sometimes the apologies for these calls are a lot more heartfelt and apparently sincere than other times). Or a baby decides it has nothing better to do at 2 am than to cry and cry and cry. Or we…