The proper management of our own bodies is even more essential to our happiness and well-being than the proper management of the land, and I hope that this book will be no less welcome to students and physicians than to the great mass who for lack of knowledge or of attention do not wholly avail themselves of the freely offered gift of sleep. The book may be useful to many who find it difficult to harmonize their lives with their surroundings, and may bring to many a happier view of the ways of God to man. EDWARD MOFFAT WEYER, Washington and Jefferson College. CONTENTS CHAPTER PAGE I SLEEP 1 II HOW MUCH SLEEP 5 III THE TIME OF SLEEP 11 IV WHAT SLEEP MAY MEAN 15 V HOW TO GO TO SLEEP 20 VI SLEEP IS NATURAL 26 VII THE DUPLEX MIND 30 VIII WAKEFULNESS 36 IX SIMPLE CAUSES OF WAKEFULNESS 40 X “LIGHT” SLEEPERS 47 XI THE GIFTS OF WAKEFULNESS 51 XII THE PURPOSE OF SLEEP 58 XIII THE SLEEP OF THE INVALID 62 XIV THE SLEEPLESSNESS OF PAIN 66 XV OPIATES 73 XVI DEVICES FOR GOING TO SLEEP 78 XVII MORE DEVICES FOR GOING TO SLEEP 84 XVIII STILL FURTHER DEVICES 88 XIX HYPNOTIC SLEEP 94 XX “PERCHANCE TO DREAM” 101 XXI NATURAL LIVING 108 XXII FRESH AIR AND REFRESHING SLEEP 113 XXIII THE BREATH OF LIFE 117 XXIV EATING AND SLEEPING 124 XXV SLEEPING AND EATING 128 XXVI SOME MODERN THEORIES OF SLEEP 133 XXVII EARLY THEORIES OF SLEEP 138 XXVIII MORE THEORIES 142 XXIX STILL MORE THEORIES 147 XXX WE LEARN TO DO BY DOING 153