First night effect and reverse first night effect in older adults with primary insomnia: does anxiety play a role? First night effect and reverse first night effect in older adults with primary insomnia: does anxiety play a role? Download Effects of short-term PAP treatment on endurance exercise performance in obstructive sleep apnea patients Initial demonstration of the accuracy and utility of an ambulatory, three-dimensional body position monitor with normals, sleepwalkers and restless legs patients