Objective : To explore the meaning of Eumyangyeokchahunobok-byung (陰陽易差後勞復病) through two cases and finding the relationship with the DSM-5 sleep-wake disorder. Methods : Following a disease pattern identification diagnostic system based on Shanghanlun provisions (DPIDS), we analyzed cases with chronic fatigue and diplopia caused after sleep disorders. The patients were treated with the Soshiho-tang and Yijoong-tang. Results : The two herbal medicines showed remarkable improvement in the patients. The sleep disorders and the secondary pathologies were rapidly relieved within a month. Conclusions : The patterns of sleep disorders of the two patients were found to be very similar to the circadian rhythm sleep-wake disorders, as described in DSM-5. Although the etymology of the Chinese characters has not been clearly known yet, it was possible to present the original hypotheses on 更and 了due to clinical inference.
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