title: The many facets of poor sleep.
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. This article roughly describes the methods of measuring the different facets of insomnia. A major difficulty in research with insomniacs is seen in the fact 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. Therefore, insomniacs' sleep quality should be assessed from as many points of view as possible.
mesh_terms: D000339:Affect; D001288:Attention; D003071:Cognition; D004569:Electroencephalography; D006801:Humans; D008950:MMPI; D011597:Psychomotor Performance; D012718:Set, Psychology; D007319:Sleep Initiation and Maintenance Disorders / Q000523:psychology*; D012895:Sleep, REM; D014851:Wakefulness