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Distinction between insufficient sleep and insomnia disorder

Distinction between insufficient sleep and insomnia disorder
  Insufficient sleep/sleep deprivation Insomnia disorder
Ability to sleep Maintained. Patient is able to sleep when given the opportunity. Disrupted. Patient cannot sleep even when an opportunity to obtain sufficient sleep is available.
Opportunity for sleep Inadequate. Patient is not in bed long enough to obtain sufficient sleep, and, therefore, suffers daytime consequences. Adequate. Patient is able to spend an adequate amount of time in bed to obtain sufficient sleep, but is not able to sleep when the opportunity is available.
Sleep duration Short sleep duration due to inadequate opportunity. Short sleep duration despite adequate opportunity.
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