Irrespective of diagnosis, chronic daily, morning, or “awakening” headache patterns are soft signs of a sleep disorder. Sleep apnea headache may emerge de novo or may present as an exacerbation of cluster, migraine, tension-type, or other headache. Insomnia is the most prevalent sleep disorder in chronic migraine and tension-type headache, and increases risk for depression and anxiety. Sleep disturbance (eg, sleep loss, oversleeping, schedule shift) is an acute headache trigger for migraine and tension-type headache. Snoring and sleep disturbance are independent risk factors for progression from episodic to chronic headache.