With eyes closed, imagine a road that leads to a hilltop at the horizon.
On the other side of every hilltop is a road leading to a hilltop at the horizon.
If you need to walk to the first hilltop, find your hands --keeping your eyes closed.
Once you find your hands, look down to find your feet on the road and start walking.
Step by step, realize that thought is action in dreams and imagination.
When you reach the hilltop and see other hilltops, are you really going to keep walking?
This process can be used to "go to sleep".
Where do we go, really?