If a sleep neroligist diagnoses idiopathic hypersomnia from sleep study, what would be the likely prognosis? Is there anything to make it better?

Hypersomnia. There is criteria to classify different hypersomnia--- if narcolepsy and similar condition ruled out, you can be DX idiopathic hypersomnia, respond good to treatment , Ritalin (methylphenidate) better than provigil j clin sleep med. 2009 dec 15;5(6):562-8. Idiopathic hypersomnia: clinical features and response to treatment.
Hypersomnia. May occur with or without long sleep time (> or < 10 hrs). Total sleep may be over 12-14 hours. • naps generally long and unrefreshing. Sleep inertia common. Need help waking up. • mslt shows average sleep latency < 8 min and < 2 sorems. • prevalence ~1: 20, 000 • onset usually around age 10-30, develops over several weeks, then stable, resolves in 25% • CSF hypocretin normal, but histamine may be.
Good. Yes. Idiopathic hypersomnia is thought to be a neurological disorder characterized primarily by excessive daytime sleepiness. The most common treatments for excessive sleepiness are stimulant medications. However, these drugs are not a substitute for sleep. People with idiopathic hypersomnia often must allow more time in their schedules for sleep than most people, even while using such medications.