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Researchers determined that 12 people had probable cases of idiopathic hypersomnia, for a prevalence of 1.5%.

The new approval will make it much easier for hypersomnia patients to get insurance coverage for Xywav.

Frequently, patients develop difficulties sleeping - severe insomnia or hypersomnia - and memory problems.

The woman's mother said her daughter was experiencing post-traumatic stress disorder, hallucinations, and was sleeping for 18 or 20 hours a day because of a condition called hypersomnia.

There were just three in the past year for other conditions, one each for hypersomnia, hypogonadism and kidney disease,