“…Some studies have reported that negative events impacting on sleep quality mainly included bad dormitory conditions (e.g., noisy roommates, snoring, gaming, lighting, mosquitos), interpersonal conflict, academic pressure, freshmen maladjustment, as well as romantic relationship problems) ( 102 , 103 ). Due to specific characteristics of smartphones (e.g., the many different types of applications), smartphones can be considered as tools that provide self-comfort and satisfy basic need of communication with others in a timely way (i.e., individuals, especially females prefer texting, blogging and chatting via smartphone) ( 104 – 106 ). Consequently, all kinds of messages from Chinese SNSs such as WeChat and QQ (e.g., different groups comprising class, grade, students’ union, different courses, etc.)…”