Distinguishing sleepiness and fatigue: focus on definition and measurement.

Abstract:

:Sleepiness and fatigue are two interrelated, but distinct phenomena; observed in a number of psychiatric, medical and primary sleep disorders. Despite their different implications in terms of diagnosis and treatment, these two terms are often used interchangeably, or merged under the more general lay term of 'tired'. Sleepiness is multidimensional and has many causes (multidetermined) and distinguished from fatigue by a presumed impairment of the normal arousal mechanism. Despite its ubiquity, no clear consensus exits as yet as to what constitutes sleepiness. Definitions of sleepiness, to date, are at best operational definitions, conceptualized so as to produce specific assessment instruments. As a result, while a number of subjective and objective measurement tools have been developed to measure sleepiness, each only captures a limited aspect of an otherwise heterogeneous entity. Fatigue is an equally complex phenomenon, its nature captured by a number of conceptualizations and definitions. Measures of fatigue have remained subjective, with a 'gold standard' for its measurement remaining elusive. Despite a high prevalence and high degree of morbidity, fatigue has remained a relatively under appreciated symptom, from both a clinical and research point of view.

journal_name

Sleep Med Rev

journal_title

Sleep medicine reviews

authors

Shen J,Barbera J,Shapiro CM

doi

10.1016/j.smrv.2005.05.004

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

63-76

issue

1

eissn

1087-0792

issn

1532-2955

pii

S1087-0792(05)00044-4

journal_volume

10

pub_type

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