This category applies to presentations in which symptoms characteristic of insomnia disorder that cause clinically significant distress or impairment in social, occupational, or other important areas of functioning predominate but do not meet the full criteria for insomnia disorder or any of the disorders in the sleep-wake disorders diagnostic class. The other specified insomnia disorder category is used in situations in which the clinician chooses to communicate the specific reason that the presentation does not meet the criteria for insomnia disorder or any specific sleep-wake disorder. This is done by recording "other specified insomnia disorder" followed by the specific reason (e.g., "brief insomnia disorder").

Examples of presentations that can be specified using the "other specified" designation include the following:

Brief insomnia disorder

Duration is less than 3 months.

Restricted to nonrestorative sleep

Predominant complaint is nonrestorative sleep unaccompanied by other sleep symptoms such as difficulty falling asleep or remaining asleep.

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