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Insomnia

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Introduction
Insomnia is difficulty getting to sleep or staying asleep for long enough to feel refreshed the next morning, even though you've had enough opportunity to sleep.
Symptoms of insomnia
The symptoms of insomnia depend on the type of sleeping problem that you have.
Causes of insomnia
Insomnia can be caused by stress, psychiatric problems, underlying physical conditions, alcohol and drug misuse or as a side effect of certain medications.
Treating insomnia
The first step in treating insomnia is to find out whether the problem is being caused by an underlying medical condition.
Self-help for insomnia
Insomnia can often be prevented by changing your daytime and bedtime habits or by improving your bedroom environment.