QUESTION UNCLEAR?: Do you mean like how many days you can go, or hours, or in general? Insomnia can be "transient" meaning short term or once in a while. Maybe situational like something is on your mind. It can also be chronic either due to illnesses like depression, bipolar, chronic pain. Or it can be a primary chronic insomnia meaning just cannot sleep. All can be treated to some extent.
Answered 12/9/2013
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Depends on cause: Insomnia is often transient, but can be patterned and self perpetuating. Best to read about sleep hygiene on line.
Answered 9/13/2017
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