Insomnia can be a symptom of a sleep disorder or other health problems.
失眠可以是睡眠紊乱或其他健康问题的征兆。
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Many people suffer from a sleep disorder known as insomnia. Insomnia is caused by many different factors including stress and an irregular sleep cycle.
Insomnia and other sleep-related problems could lead to illnesses including psychiatric conditions, attention deficit disorder, post traumatic stress and depression, research suggests.