参考文献:National Institute of Neurological Disorders and Stroke. Brain basics: Understanding sleep. Retrieved April， 2021， from见原文链接， T. E.， & Greene， R. W. . Adenosine and sleep. Current Neuropharmacology， 7， 238-245.Ribeiro， J. A.， & Sebastiao， A. M. . Caffeine and adenosine. Journal of Alzheimer's Disease， 20， S3-S15. 菟丝子提取物对失眠大鼠血清细胞因子及SOD、MDA的影响. 刘海云;
Another passenger， Marco Yung， said that he joined the tour because he usually falls asleep on long-distance bus journeys， saying it was a “great opportunity” to get some sleep.
就在李晓芳犹豫要不要去医院检查时，她偶然在网上看到一篇文章:《一坐车就打瞌睡的人，可能身体有这些问题!》文章中提到，经常在车上打瞌睡可能是多种健康问题的征兆，包括睡眠呼吸暂停综合征、缺铁性贫血、甲状腺功能减退等。
