Sleep components such as subjective sleep quality (r = 0.175, p = 0.03), Sleep latency (r = 0.260, p <0.01), sleep duration = 0.185, p = 0.02), sleep efficiency (r = 0.210, p <0.01), and daytime dysfunction (r = 0.258, p <0.01) were also positively correlated slightly with HbA1c.