Insomnia is the inability to sleep, or to sleep satisfactorily, and is the most common sleep disorder. It may involve restless or interrupted sleep, a reduction in the usual time you spend sleeping or, in rare cases, complete wakefulness. Insomnia is a symptom rather than an illness in itself: in the majority of cases, sleeplessness has an underlying cause. When no underlying cause can be found, a person is said to be suffering from primary insomnia.
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Insomniacs may experience loss of energy and enthusiasm, have problems with memory and concentration, and may feel ill, sleepy and frustrated. Poor sleep can be associated with accidents, lower work productivity and may worsen medical and psychological conditions. These consequences make insomnia an important health problem that deserves serious attention.
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