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Drs. Elan D. Louis, James M. Noble, and Stephan A. Mayer in New York City, May 2018 at 14th edition planning meeting. The book began in 1955 as a sole author publication by its originator H. Houston Merritt, and has had a total of 6 editors or co-editors since its inception, including H. Houston Merritt (Editions 1-6 until his death in 1979), [1] Lewis P. Rowland (Eds 7-13 until his death in ...
For home-testing for an unusually low sleep latency and potential sleep deprivation, the authors point to a technique developed by Nathaniel Kleitman, the "father of sleep research". The subject reclines in a quiet, darkened room and drapes a hand holding a spoon over the edge of the bed or chair, placing a plate on the floor beneath the spoon.
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic , bifurcated , or bimodal ) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]
The 11th century, with 13, evidences a certain recovery, and the 12th century, with 40, surpasses the 9th, something that the 13th, with just 26, fails to do. There was indeed a 'dark age', in Baronius's sense of a "lack of writers", between the Carolingian Renaissance in the 9th century and the beginnings, sometime in the 11th, of what has ...
Delayed sleep phase disorder (DSPD), more often known as delayed sleep phase syndrome and also as delayed sleep–wake phase disorder, is the delaying of a person's circadian rhythm (biological clock) compared to those of societal norms.
The crisis of the Middle Ages was a series of events in the 14th and 15th centuries that ended centuries of European stability during the late Middle Ages. [1] Three major crises led to radical changes in all areas of society: demographic collapse, political instability, and religious upheavals.
Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and ...