Well sometimes when i go to bed I start thinking about any subject and then my brain does the rest! When we are asleep, our whole body rests so that the brain can concentrate on itself and it can go to many directions! Sometimes there are connections with what we are living at the moment in a way to evacuate stress! The brain is so powerful that anything is possible! think about the billions of connections between our neurons! Think about people who are quadriplegic and can only use their brain like Steven Hawking for example! Just unimaginable or unthinkable or incredible!