According to the DSM-5 diagnostic criteria, for an insomnia disorder diagnosis to be made, the sleep difficulties must be present for at least 3 months. Additionally, the symptoms should occur at least 3 nights per week. This means that the individual experiences significant trouble in initiating sleep, maintaining sleep, or returning to sleep despite having the opportunity to sleep.

For further reference, you can explore more detailed criteria and definitions regarding insomnia disorders as outlined in the following sources:

1. Insomnia Disorder - PsychDB provides a concise summary of the diagnostic criteria.
2. Table 3.36, DSM-IV to DSM-5 Insomnia Disorder Comparison - NCBI offers a comparison of insomnia disorder criteria across different DSM versions.
3. Insomnia: The DSM-5 Criteria for Diagnosing - Psych Central discusses symptoms and criteria in the context of sleep-wake disorder.

This duration is critical in distinguishing chronic insomnia from shorter-term sleep issues.

Sources

Table 3.36, DSM-IV to DSM-5 Insomnia Disorder Comparison - NCBIInsomnia: The DSM-5 Criteria for Diagnosing - Psych CentralEvaluating DSM-5 Insomnia Disorder and the Treatment of Sleep ...Insomnia Disorder - PsychDBInsomnia Disorder DSM-5 780.52 (G47.00) - Therapedia - TheraviveEvaluating DSM-5 Insomnia Disorder and the Treatment of Sleep ...Insomnia - Symptoms, diagnosis and treatment | BMJ Best Practice US

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