It is best for you to close your mouth while you are going to sleep, and breathe through your nose, so that the air will be properly purified and warmed before it reaches your lungs. If you can't do this, your mother can perhaps give you something to wash out your nose, so that you can breathe freely. If that does not help, you had better see a doctor, and he will find some way to clear your head so that you can use your nose comfortably. Suppose you take a pencil and paper and write down all you did yesterday. Wasn't it enough to make you tired and sleepy and want a chance to rest? Even while you sleep, your heart keeps beating, and you don't stop breathing, of course. But your muscles are quiet, and your food tube rests. Your brain rests, too,--better in sleep than at any other time,--so that when morning comes you are as "lively as a cricket" and quite ready for the new day. Yet even in sleep your brain does not stop working entirely, but goes on receiving messages from the stomach and the skin and the memory, and mixing them up together in the strangest fashion, so that you _dream_, as you say. You ought not to dream very much if you are perfectly well; but as long as your dreams are pleasant or amusing, you need not pay any attention to them. But if you have had bad dreams, or you dream so hard all night long that you don't feel rested in the morning, then you had better speak to your mother about it, and let her see what is the matter with your digestion or your nerves, or take you to a doctor. Bad dreams are always a sign of ill health and are a very disagreeable thing, from which there is no need that you should suffer any more than from headache or indigestion or colic. Dreams, of course, do not mean or foretell anything whatever, except simply how bad, or good, the state of your digestion and your nerves is. Now, how much time should you spend in bed? Well, I think at your age nearly half the time. Ten or eleven hours of sleep make you ready for all the hours of work and play, and you don't become cross and tired half so easily if you have plenty of sleep. Though you are lying so quietly, you are not by any means wasting your time, for you probably are growing faster when you are asleep than when awake. Babies, who are growing very fast, you know, sleep nearly all the time. So after you have opened all the windows wide, put out the light and jump into bed and lie down for a good night's rest without thinking about anything except how comfortable the bed feels when you are tired. QUESTIONS AND EXERCISES GOOD MORNING