Insomnia Insomnia
Insomnia Insomnia
Insomnia Insomnia
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<strong>Insomnia</strong> in Children and Adolescents 57<br />
Some children with asthma suffer from insomnia. Children with asthma have<br />
more frequent arousals and earlier final wake times (18). Sleep-onset insomnia is<br />
rarely the problem. Most asthma attacks in children occur in the last two-thirds of<br />
the night (19). This coincides with the poorest lung function occurring during the<br />
24-hour cycle. Peak flow is 50% of waking maximum and oxygen saturations may<br />
fall 10% (20,21). The nocturnal arousals associated with asthma have been found<br />
to have consequences for school performance. Increases in daytime sleepiness as<br />
measured using the epworth sleepiness scale, variable attention in school, and increased<br />
daydreaming as measured by neuropsychological tests. These tests measure<br />
both errors of commission that correlate with hyperactivity and omission that<br />
correlate with distractibility (22).<br />
Finally, although bruxism is not a cause of sleeplessness, it may be a symptom.<br />
Children who grind their teeth as a self-calming mechanism do so less when time in<br />
bed is decreased (23).<br />
INSOMNIA IN THE SCHOOL-AGED CHILD<br />
School age includes the ages between 5 years and adolescence. The incidence of<br />
sleep disorders decreases in school-age children (24). Fears and anxieties both at<br />
sleep onset and in the middle of the sleep period are the most common complaint in<br />
this age group. Often, these are short-term anxieties manifesting as insomnia. This<br />
is often termed adjustment sleep disorder. In other cases, anxieties may be a manifestation<br />
of more lasting emotional, psychological, or psychiatric disorders such as<br />
depression and posttraumatic stress disorder (25). One must be aware that insomnia<br />
also may be a symptom of child sexual abuse (26). <strong>Insomnia</strong> is commonly reported<br />
in children with attention deficit hyperactivity disorder (ADHD). Parents commonly<br />
report that these children have difficulty falling asleep, are restless sleepers, and<br />
awaken early (27,28). Additionally, treatment for ADHD with stimulant medications<br />
may worsen sleep (29).<br />
SLEEP DISORDERS IN ADOLESCENCE<br />
Adolescence sees the emergence of circadian rhythm disorders. Even teens without<br />
a circadian rhythm disorder have a tendency toward later sleep onset, increased<br />
total sleep requirement, and an increase in daytime sleepiness when compared to<br />
preadolescents (30,31). Adolescents are predisposed to a delayed sleep onset. This<br />
is caused by a change in their biological clock. In reference to biological clocks, the<br />
term period refers to the length of the circadian cycle and is approximately, but not<br />
exactly, 24 hours. In the general population, the circadian period is approximately<br />
24.5 hours, explaining why it is easier to stay up later than go to bed earlier for most<br />
people. In adolescence, the period becomes prolonged. In some teens, it may exceed<br />
25 hours (30,31). The biological phenomenon of delayed sleep phase driven by the<br />
adolescent circadian clock has been separated from the social pressures on teens to<br />
stay up later. Work by Carskadon et al. has emphasized that the tendency is biological<br />
and not merely a preference or effect of social pressures (31). This emphasizes