Imagine an alien species with the power to fall asleep at will – they would regard human bedtime behaviour as essentially ridiculous. ‘Rather than just going to sleep, they go through a strange religious ritual,’ an alien anthropologist would remark. ‘They turn off lights, reduce all noise to a minimum and then remove the seven decorative cushions which for no apparent reason are placed at the head of the bed.* Then they lie in silence and darkness, in the hope that sleep descends upon them. And rather than simply waking up when they wish, they program a strange machine which sounds a bell at
...more
