“It is remarkable that when you wake up in the morning you nearly always find everything in exactly the same place as the evening before. For when asleep and dreaming you are, apparently at least, in an essentially different state from that of wakefulness; and therefore . . . it requires enormous presence of mind , or rather quickness of wit, when opening your eyes to seize hold as it were of everything in the room at exactly the same place where you had let it go on the previous evening . . . The moment of waking up was the riskiest moment of the day.”