Transient recurrent situational insomnia associated with cluster headache.

Headache syndromes are known to occur in association with sleep. Both the clinical and the polysomnographic abnormalities occurring in association with various headache syndromes have been described. We report the occurrence of transient recurrent situational insomnia that occurred in association with chronic cluster headaches and was reversible after the headache cluster subsided. This seems to represent a further degree of sleep disturbance in addition to the previously described insomnia and other abnormal polysomnographic features that may occur in direct association with the headache syndromes.