The Nature of Sleep

Someone who believes that during sleep nothing happens to us, could also think, that nothing needs to be done to the ship when it returns to port from a voyage. But when the ship sails again, he will see what happens, if it has not been repaired. This is how it would be if our soul did not work on us during sleep. We are brought back to ourselves when we sleep, while during the day life we are lost to the outside world. A normal human being is just not able to perceive what the soul is doing during sleep in the same way as he perceives the outside world during the day.