 This study examined the correlation between systemic inflammation markers and sleep parameters in patients with obstructive sleep apnea, OSA. The study found that the apnea hyponia index, HI, and Pittsburgh sleep quality index, PSQI, were significantly correlated with the systemic immune inflammation index, SII. Additionally, within the severe OSA subgroup, the AHI and PSQI were independently associated with the SII. This article was authored by Minji Kim, Sung Wucho, Tabin One, and others.