Effects of a weak diffuse-brain-stimulation on insomniacs with vibration syndrome.

To verify the efficacy of a weak diffuse-brain-stimulation (DBS) method that was specially devised by this research team, a weak DBS was administered to seven male inpatients, who had vibration syndrome due to a prolonged use of a vibratory tool and who were simultaneously complaining of insomnia. Sleep data obtained from the polygraphic recordings on the DBS-treated night were compared with those on the pseudo DBS-treated. As the result, this DBS method proved to be effective in improving patients' sleep initiation and/or maintenance, and also their subjective ratings on the quality of actual sleep. In conclusion, the present DBS was determined to produce a decrease in the sympathetic tone which is needed at the onset of sleep.