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In recent years, studies have shown that overnight mobilization of fluid from the legs to the central circulation (also known as “nocturnal rostral fluid shift”) can result in increased neck circumference and increased airway collapsibility. Could this phenomenon contribute to obstructive sleep apnea (OSA)? To find out, researchers in Paris conducted a randomized crossover trial involving 12 nonobese adults with known OSA and chronic venous insufficiency. Each person wore compression stockings during waking hours for 1 week and no compression stockings for 1 week. The hypothesis was that wearing compression stockings would prevent fluid accumulation in the legs during the day, resulting in less displacement of fluid into the neck while the …