It's early evening. Everyone has eaten dinner and the kitchen is already tidied up. All the children have done their homework and music practice. Nobody is saying they're bored or squabbling with a sibling or complaining that the Xbox has switched off at 7 p.m. The peace and quiet is unnatural. I don't know what to do with myself! What on earth has gone wrong with my children? This time yesterday they were playing an extremely boisterous board game and then refusing to go to bed.