Zen does not believe in meditating one hour in the morning, or one hour in the night. It does not make meditation a separate, particular act. It wants meditation to become a quality of your being. So whatever you are doing — walking, sitting, standing, lying down, chopping wood, carrying water from the well, it does not matter. Whatever you are doing, you are doing it so silently, so peacefully, without any stirring of thoughts in your mind.
Then your whole life has become meditation. You go to bed silently, you wake up silently, and one day you will realize that you also sleep silently — as thoughts disappear, dreams also disappear. Then the circle is complete.