Idiopathic hypersomnia can be hard to diagnose and treat, but it’s possible. ... "At one point, while waiting for one of my kids to read a letter sound, I was about to nod off," she says.

People with idiopathic hypersomnia get a good night’s sleep but feel excessively tired during the day. They also have difficulty waking up and feel confused when doing so.

Harmony on Wednesday said the FDA issued a "refusal-to-file" letter, ... with a target of FDA approval in idiopathic hypersomnia in 2028.