Patient presents with complaints consistent with insomnia disorder.  The patient reports difficulty initiating sleep, difficulty maintaining sleep characterized by frequent awakenings or problems returning to sleep after awakenings, and early morning awakening with inability to return to sleep.  These sleep difficulties occur at least three nights per week and have been present for approximately [duration - e.g., three months].  The patient acknowledges that adequate opportunity for sleep is available.  The patient reports daytime impairment related to the sleep disturbance, including fatigue, difficulty concentrating, irritability, and decreased mood.  The sleep difficulties are not better explained by another sleep disorder such as restless legs syndrome, narcolepsy, or a breathing-related sleep disorder.  The symptoms are not attributable to the physiological effects of a substance (e.g., medication or drug of abuse).  The insomnia is not better explained by another mental disorder or medical condition.  Differential diagnoses considered include circadian rhythm sleep-wake disorders, anxiety disorders, and depression.  Objective findings include observations of fatigue and reduced concentration during the clinical interview.  Assessment: Insomnia disorder, chronic.  Plan:  Patient education regarding sleep hygiene practices including regular sleep schedule, creating a conducive sleep environment, and avoiding caffeine and alcohol before bed.  Cognitive behavioral therapy for insomnia (CBT-I) will be considered.  Pharmacological interventions may be considered if CBT-I is unsuccessful or not readily available, with options including short-term use of non-benzodiazepine hypnotics such as zolpidem tartrate or eszopiclone.  Follow-up scheduled in [timeframe - e.g., two weeks] to assess treatment response.  ICD-10 code: F51.01  (Chronic insomnia disorder).