Next in importance is the mental attitude in which you go to sleep. It is well to sleep intelligently, purposefully, knowing what you do it for. Lie down thinking that sleep is an infallible vitalizer, and go to sleep with a confident faith that your strength is to be renewed; that you will awake full of vitality and health. Put purpose into your sleep as you do into your eating; give the matter your attention for a few minutes, as you go to rest. Do not seek your couch with a discouraged or depressed feeling; go there joyously, to be made whole. Do not forget the exercise of gratitude in going to sleep; before you close your eyes, give thanks to God for having shown you the way to perfect health, and go to sleep with this grateful thought uppermost in your mind. A bedtime prayer of thanksgiving is a mighty good thing; it puts the Principle of Health within you into communication with its source, from which it is to receive new power while you are in the silence of unconsciousness. You may see that the requirements for perfectly healthy sleep are not difficult. First, to see that you breathe pure air from out of doors while you sleep; and, second, to put the Within into touch with the Living Substance by a few minutes of grateful meditation as you go to bed. Observe these requirements, go to sleep in a thankful and confident frame of mind, and all will be well. If you have insomnia, do not let it worry you. While you lie awake, form your conception of health; meditate with thankfulness on the abundant life which is yours, breathe, and feel perfectly confident that you will sleep in due time; and you will. Insomnia, like every other ailment, must give way before the Principle of Health aroused to full constructive activity by the course of thought and action herein described. The reader will now comprehend that it is not at all burdensome or disagreeable to perform the voluntary functions of life in a perfectly healthy way. The perfectly healthy way is the easiest, simplest, most natural, and most pleasant way. The cultivation of health is not a work of art, difficulty, or strenuous labor. You have only to lay aside artificial observances of every kind, and eat, drink, breathe, and sleep in the most natural and delightful way; and if you do this, thinking health and only health, you will certainly be well. CHAPTER XVI. SUPPLEMENTARY INSTRUCTIONS.