Chronic obstructive pulmonary disease (COPD) and idiopathic pulmonary fibrosis (IPF) have been reported to be associated with a high rate of sleep-related disorders such as insomnia, sleep-related hypoventilation, and sleep apnea syndrome.Sleep-related disorders cause symptoms such as daytime sleepiness, decreased ADL, and depression, which causes cognitive dysfunction. Both COPD and IPF have been reported to be associated with cognitive dysfunction. Recently, it has been focused on the relationship between sleep-related disorders and sarcopenia. The relationship between sleep hygiene, cognitive dysfunction, and sarcopenia in the patients with COPD or IPF is not well understood.
