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Night noise guidelines for Europe - WHO/Europe - World Health ...

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18<br />

SLEEP AND HEALTH<br />

Table 2.3<br />

Mean sleep latency<br />

Source: Ebersole and Pedley, 2003.<br />

Group MSLT (min) No REM SO 1 REM SO 2 or more<br />

(% of group) (% of group) REM SO<br />

(% of group)<br />

Narcoleptics 2.9 ± 2.7 2 2 96<br />

EDS (nonnarcoleptic,<br />

8.7 ± 4.9 92 8 0<br />

non-sleep<br />

apnoeic)<br />

Controls 13.4 ± 4.3 100 0 0<br />

2.1.2 DEFINITIONS OF DISTURBED SLEEP<br />

Sleep disorders are described and classified in the International Classification of Sleep<br />

Disorders (ICSD) (American Academy of Sleep Medicine, 2005).<br />

When sleep is permanently disturbed and becomes a sleep disorder, it is classified in the<br />

ICSD 2005 as “environmental sleep disorder”. Environmental sleep disorder (of which<br />

<strong>noise</strong>-induced sleep disturbance is an example) is a sleep disturbance due to a disturbing<br />

environmental factor that causes a complaint of either insomnia or daytime fatigue<br />

and somnolence. Secondary deficits may result, including deficits in concentration,<br />

attention and cognitive per<strong>for</strong>mance, reduced vigilance, daytime fatigue, malaise,<br />

depressed mood and irritability. The exact prevalence is not known. Fewer than 5% of<br />

patients seen at sleep disorder centres receive this diagnosis. The sex ratio is not<br />

known. The disorder may occur at any age, although the elderly are at more risk <strong>for</strong><br />

developing this condition (American Academy of Sleep Medicine, 2005).<br />

2.1.2.1 Insomnia<br />

In the ICSD 2005 the section on insomnia includes a group of sleep disorders all of which<br />

have in common the complaint of insomnia (adjustment insomnia, psychophysiological<br />

insomnia, paradoxical insomnia, idiopathic insomnia, etc.), defined as repeated difficulty<br />

with sleep initiation, duration, consolidation or quality that occurs despite adequate<br />

time and opportunity <strong>for</strong> sleep and results in some <strong>for</strong>m of daytime impairment.<br />

Insomnia is a symptom that often arises from primary medical illness, mental disorders<br />

and other sleep disorders, but may also arise from abuse or exposure. However, the general<br />

criteria <strong>for</strong> insomnia are the same <strong>for</strong> all subgroups of insomnias.<br />

2.1.2.2 General criteria <strong>for</strong> insomnia<br />

A. A complaint is made concerning difficulty initiating sleep, difficulty maintaining<br />

sleep, waking up too early or sleep that is chronically non-restorative or poor in<br />

quality. In children, the sleep difficulty is often reported by the carer and may<br />

consist of observed bedtime resistance or inability to sleep independently.<br />

B. The above sleep difficulty occurs despite adequate opportunity and circumstances<br />

<strong>for</strong> sleep.<br />

C. At least one of the following <strong>for</strong>ms of daytime impairment related to the nighttime<br />

sleep difficulty is reported by the patient:<br />

• fatigue or malaise<br />

• attention, concentration, or memory impairment<br />

• social or vocational dysfunction or poor school per<strong>for</strong>mance<br />

• mood disturbance or irritability<br />

NIGHT NOISE GUIDELINES FOR EUROPE

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