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Background: Fluid shift from lower body to neck when recumbent in bed at night will narrow the upper airway (UA) and increase neck circumference (NC), which will increases the possibility of airway collapse.However we are not yet clear whether there is a correlation between the increases of neck circumference and the decreases of the upper airway cross-sectional area.The aim of this study is to test the hypothesis that in subjects with OSA, a large increase in NC due to fluid displacement is not necessarily linked to an apparent reduction in NC, and vice versa.