What is another word for Hypnic Headache Syndrome?
Pronunciation: [hˈɪpnɪk hˈɛde͡ɪk sˈɪndɹə͡ʊm] (IPA) 
Hypnic Headache Syndrome, also known as alarm clock headache, is a rare sleep disorder characterized by recurrent headaches that awaken an individual from sleep. While the condition is relatively uncommon, it can be debilitating for those affected. A lesser-known synonym for this condition is "hypnogenic headache", as the headaches are triggered during the sleep-wake transition. The term "nocturnal headache" is also occasionally used to describe this syndrome, as the headaches occur predominantly during nighttime rest. Though the exact causes of hypnic headaches remain unknown, understanding the array of synonyms can help assist in communication and further exploration of treatments for this perplexing disorder.
