Chang GH, Hsu CM, Huang EI, et al. - This is the first study examining the connection between prone position and nasal patency. The authors used a visual analog scale score and acoustic rhinometry to assess nasal patency of 30 healthy people without upper respiratory tract disorders in 7 positions: sitting; frontal, right, and left supine; and frontal, right, and left prone. According to the findings of this study, the prone position reduces nasal patency, and the effect is more noticeable than in the supine position in terms of subjective aspects. Furthermore, the prone position may cause an increase in venous pressure due to gravity, particularly in the nasal valve area, resulting in decreased nasal patency. More research is needed to investigate the effect of prone position on nasal patency in patients with breathing disorders during sleep.