Headache and sleeping problems are both some of the m ost commonly reported problems in clinical practice, and cause considerable social and family problems, as well as socio-economic impact and costs. The mechanisms of relationship between sleep and headache are complex, multifactorial and poorly understood. Identifying and classifying the specific headache disorder in patients with both headache and sleep disturbances can facilitate an appropriate diagnostic evaluation. Korean Journal of Headache 7(1):23-26, 2006