Question: what is the difference between hypersomnia and idiopathic hypersomnia?
Answer: In some classification systems (such as the ICSD-3, which the HF follows), “hypersomnia” is reserved to refer to specific disease entities, such as idiopathic hypersomnia and the related sleep disorders, while “hypersomnolence” refers to the symptoms of long sleep and/or excessive daytime sleepiness regardless of cause ...