Abstract
The patient was a 61-year-old female who started hemodialysis in December 1989. In September 1990, She reported excessive daytime somnolence, and sleep apnea was observed during hemodialysis. A diagnosis of sleep apnea was made on the basis of polysomnography findings. Because of a tendency toward overhydration the patient's dry weight was reduced, and that in turn decreased her excessive daytime somnolence, and sleep apnea during hemodialysis was no longer observed. In December 1990, the reduction in sleep apnea was confirmed by a second polysomnogram. It seems necessary to consider the possibility of sleep apnea syndrome in hemodialysis patients with sleep disturbance.