If the history is positie , then it is followed by polysomnography , an oernight sleep study that usually looks at sleep stages , time in stages , oxygenation , co2 leels , time spent in less than 90 % o2 saturation , and rdi 如果規(guī)律性研究結(jié)果是正性的,那么接下來(lái)就要用多導(dǎo)睡眠描記法檢查,一種通常觀察睡眠分期,各期時(shí)間,氧氣,二氧化碳水平,飽和90以下氧氣的時(shí)間,及rdi的通宵睡眠研究。