利文森表示，一个人访问社交媒体网站的次数比花在社交媒体上的总时长能更好的预测睡眠问题。
Levenson said the number of times a person visits social media is a better predictor of sleep problems than overall time spent on social media.
计算平均网站停留时间，谷歌分析划分的总时间为所有的访问的访问次数。
To calculate Average Time on Site, Google Analytics divides the total time for all visits by the number of visits.
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