Causes of insomnia--Affections of the organs of special sense--Effects of light--Effect of sound--Impressions upon the organs of smell and taste--Disturbances caused by a high temperature--Atmospheric and electrical disturbances-- Effects produced by cold--Hibernation of animals-- Disturbances of sleep occasioned by painful sensations-- Disorders of the sympathetic nerves--Morbid states of the central nervous organs--Disorders of circulation and nutrition--Hyperæmia of the brain--Anæmia and starvation of the brain--Effects of tea and coffee--Effect of alcohol-- Inflammations, degenerations, and tumors affecting the brain--Excitement of the brain by diseased conditions of the blood. 38 CHAPTER III. REMEDIES FOR INSOMNIA. Serious consequences of insomnia--Its relation to cerebral diseases--Treatment of insomnia by moderation and control of the cerebral circulation--Remedial agents--Nervous stimulants and nervous sedatives--Heat--Baths--Massage-- Electricity--Counter-irritants--Food--Digitalis--Camphor-- Musk--Valerian--Cannabis indica--Belladonna--Hyoscyamus-- Stramonium--Phosphorus--Acids--Opium--Cold--Alcohol-- Paraldehyde--Ether--Chloroform--Chloral--Butylchloral hydrate--Amyl nitrite--Opium and opiates--Bromides--Hops-- Gelsemium--Conium. 56 CHAPTER IV. TREATMENT OF INSOMNIA IN PARTICULAR DISEASES. Insomnia in acute affections of the brain--In insanity--In chronic alcoholism and delirium tremens--In diseases of the heart and blood-vessels--In angina pectoris--In diseases of the respiratory organs--In asthma--In renal diseases--In diseases of the liver--In gastro-intestinal diseases--In febrile conditions--In rheumatism and gout--In lithæmia--In syphilis--In disorders of nutrition--During pregnancy and after parturition--In spasmodic diseases--In childhood--In old age. 92 CHAPTER V. DREAMS.