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Abstract
Sleep is an essential part of life. It is not a passive state of unconsciousness,
but rather a dynamic brain processthat is the result of the interaction between two
largely independent basic mechanisms: the circadian rhythm and the homeostatic drive
to sleep. Its exact role has yet to be elucidated but it is known that sleep plays
an important role in the restoration of physical and mental functioning.
Sleep can be described both quantitatively and qualitatively, subjectively and objectively.
Recent research hasled to a substantially improved understanding of both normal and
altered sleep patterns, and their impact on health. A large diversity of factors has
been described that can either favourably or adversely influence sleep, including
sleep deprivation, sleep fragmentation, medical conditions and external stimuli. Normal
sleep patterns vary significantly across the life-course, with more disrupted and
less efficient sleep seeming to occur in the elderly. Sleep disorders are frequent
and diverse in their origin, and commonly result in excessive daytime somnolence,
which can have a major impact on daytime performance and safety in the individual.
Also, chronic sleep disturbance is associated with increased morbidity and mortality.
It is thus important that the quality of sleep is maintained, and situations and conditions
known to have a negative impact on sleep initiation and maintenance should be prevented
or treated.
Keywords
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© 2005 Elsevier B.V. Published by Elsevier Inc.