Several epidemiological studies suggest that the circulatory levels of natriuretic peptide (BNP) or N-terminal-pro-BNP [15], leptin, C-reactive protein (CRP) [16, 17], TNFα [18], vaspin [19], ghrelin [20], and interleukin-6 [17] are associated with OSA. Here, CRP is linked to obstructive sleep apnea syndrome.