The Many Facets of Poor Sleep

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Abstract
Insomnia is a syndrome composed of symptoms of disturbed sleep, decrement of day-time performance and depressed mood to various degrees and in various combinations. The methods of measuring the different facets of insomnia are described. A major difficulty in research with insomniacs is seen in that many methods have been developed in research with young healthy volunteers, not with insomniacs. While good sleep is a homogeneous phenomenon, and its quality will be described similarly well by different methods, insomnia is a very heterogeneous syndrome with low intercorrelation of the different measures. Insomniacs'' sleep quality shoud be assessed from as many points of view as possible.

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