Morning headaches can be a good indicator of depression and insomnia and are not specific only to sleep-disordered breathing.

Results based on a telephone survey with questions about morning headaches, organic disorders, psychoactive substance use, sleep disorders and psychiatric disorders. The survey was administered to a sample of 18,980 people over 15 years of age from the general populations of the UK, Germany, Italy, Portugal and Spain. 1442 (7.6%) admitted to suffering from persistent morning headaches.