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Conspicuous among the disorders which play a prominent rôle in undermining our health and destroying our peace of mind are the various types of insomnia and pathologic sleep.
Physiologic sleep is simply a period of resting for all our organs, their functions being markedly lowered, central control diminished, and changes of reconstruction occurring in our nervous equilibrium. The nervous patient sleeps badly, but the nature of the insomnia varies in many ways. Some go to sleep the moment they lie down, only to awake an hour or two later, to toss throughout the night, and possibly to doze off at the hour when they should awake. Others sleep well till the first peep of day, rising ill-humored and cross, having lost two of their nine hours' sleep. Some patients apparently never sleep and remain calm and comfortable the entire night, get very restless and provoked, get up and walk around
FISHER JT. TYPES OF INSOMNIA AND TREATMENT WITHOUT DRUGS.. JAMA. 1906;XLVII(22):1825–1826. doi:10.1001/jama.1906.25210220051001n