“Like most species, we have come to expect that we shall wake up more or less where we fell asleep. We associate the night with being static, becalmed. We might toss and turn a bit, and some may even sleepwalk. But as a rule it is the one period in each 24-hour shift when our frenzied movements hither and yon come to a halt. Hence there is something indefinably sneaky about popping up somewhere in the morning at a location that bears little relation to the one we were inhabiting the night before. It is perhaps the nearest most of us come to performing a magic trick.”