Several studies have revealed that biological/psychosocial fitness could influence sleep duration [15], [16] and [19]. Our present study further confirmed that, among six biological/psychosocial conditions, four were significantly associated with insufficient sleep duration.
Associations of obesity and chronic pain with sleep duration have been reported in other studies [20], [30] and [34]. Our study provided new evidence for these associations among Chinese adolescents. Mental and psychosocial disability has been a major concern in modern competitive society [35]. Particularly, puberty is a very vulnerable stage for emotional and mental problems [36]. The present study demonstrated that more than one-third of Chinese adolescents frequently went through negative emotion during bedtime; it is the first study to establish the associations between negative mental condition and insufficient sleep duration among Chinese adolescents. By contrast, the associations were not established among our previous study in school-aged children [30].