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Insomnia is a sleep disorder in which you have trouble falling and/or staying asleep.
The condition can be short-term (acute) or can last a long time (chronic). It may also come and go.
Acute insomnia lasts from 1 night to a few weeks. Insomnia is chronic when it happens at least 3 nights a week for 3 months or more.
There are two types of insomnia: primary and secondary.
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