In simple words: Idiopathic hypersomnia with long sleep time is a sleep disorder where a person sleeps too much, often more than 9 hours at a time, and still feels very tired during the day.They may find it hard to wake up and feel confused when they do.Doctors don't know exactly what causes it, and it's different from other sleep disorders because it doesn't involve sudden muscle weakness during the day.

Idiopathic hypersomnia with long sleep time is a neurological sleep disorder characterized by excessive daytime sleepiness (EDS) and prolonged sleep episodes, typically exceeding 9 hours.The condition is differentiated from other hypersomnias by the absence of cataplexy (sudden muscle weakness) and its unknown cause ("idiopathic").Symptoms include difficulty waking, disorientation upon awakening, and persistent fatigue despite long sleep duration.Other associated symptoms may include excessive sweating, headaches, orthostatic hypotension, low energy, restlessness, slowed thinking and speech, reduced appetite, and sleep-related hallucinations. Diagnosis is based on clinical evaluation, sleep history, and polysomnography (sleep study) to rule out other sleep disorders.

Example 1: A 30-year-old patient reports excessive daytime sleepiness despite sleeping for 10-12 hours each night.They experience difficulty waking up, feel groggy and disoriented for extended periods after waking, and have frequent unintended daytime sleep episodes.Polysomnography reveals no signs of sleep apnea or other sleep disorders, and a neurological examination is normal.Diagnosis: G47.11., A college student consistently sleeps for 11 hours but still feels unrefreshed and struggles to stay awake during classes.They deny cataplexy and have no other significant medical history.After ruling out other sleep disorders through a sleep study, the physician diagnoses them with idiopathic hypersomnia with long sleep time (G47.11). , A 45-year-old individual experiences persistent daytime sleepiness and regularly sleeps more than 9 hours per night.They also complain of headaches and difficulty concentrating.After a comprehensive evaluation, including a sleep study and neurological assessment, they are diagnosed with G47.11.

Documentation should include detailed sleep history (sleep duration, quality, daytime sleepiness patterns), results of polysomnography and Multiple Sleep Latency Test (MSLT), neurological examination findings, and any other relevant medical history.Symptom descriptions, such as difficulty waking, prolonged sleep episodes, and daytime impairment, are crucial.