|Description||I had a correspondent comment to me about the hypothesis that sleep could be an illusion. They said: "What is the bit of us which sleeps, it can only be our awareness; nothing physical. That all has to keep working or we'd fall off the perch." However that makes absolutely no sense at all! How can nothing physical undergo a physical transformation (from awareness to non-awareness), as in going to sleep? It's like saying that mathematics goes to sleep or beauty goes to sleep or time goes to sleep or Wednesday goes to sleep.