Patient presents with primary complaint of excessive daytime sleepiness (EDS), fulfilling diagnostic criteria for hypersomnolence disorder.  The patient reports persistent daytime sleepiness, despite obtaining adequate nocturnal sleep duration (greater than 7 hours) and experiences difficulty maintaining wakefulness during the day, often resulting in unintended lapses into sleep.  Symptoms include significant daytime fatigue, brain fog, and difficulty with concentration.  Patient denies cataplexy, sleep paralysis, and hypnagogic hallucinations, ruling out narcolepsy.  The Epworth Sleepiness Scale (ESS) score is elevated at [insert score].  A multiple sleep latency test (MSLT) revealed a mean sleep latency of [insert value] minutes and [insert number] sleep onset REM periods (SOREMPs), further supporting the diagnosis of hypersomnolence.  Differential diagnoses considered included obstructive sleep apnea, circadian rhythm sleep disorders, and other medical conditions such as hypothyroidism, but these were ruled out based on clinical evaluation and diagnostic testing (e.g., polysomnography, thyroid function tests).  The patient's medical history includes [list relevant medical history].  Current medications include [list current medications].  A treatment plan was discussed, focusing on behavioral interventions such as sleep hygiene optimization and scheduled naps.  Pharmacological treatment options, including wake-promoting agents such as modafinil or armodafinil, were also considered and discussed with the patient.  Follow-up appointment scheduled in [timeframe] to assess treatment response and adjust management as needed.  ICD-10 code G47.1 (hypersomnia) is assigned.  The patient was educated on the importance of medication adherence and lifestyle modifications for effective management of hypersomnolence.