For diagnosis of<unk>  syndrome,<unk> s should occur at least 15 times per month for at least one month. Included in the differential diagnosis of a new onset nighttime<unk> s in the elderly is drug withdrawal, temporal arteritis, Sleep apnea, oxygen desaturation, Pheochromocytoma, intracranial causes, primary and secondary neoplasms, communicating hydrocephalus, subdural hematoma, vascular lesions, migraines, cluster<unk> s, chronic paroxysmal hemicrania,<unk> s due to bruxism, and<unk> . All other causes must be ruled out before the diagnosis of<unk>  can be made.
Hypnic headache
Exploding head syndrome
Cold-stimulus headache
External compression headache
Red wine headache
Vascular headache
Tension headache
Thunderclap headache