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