Compared to other environment factors, such as noise, light, and temperature, bed/room sharing seemed to have greater impact on adolescents' sleep duration. In addition, we found that parents' sleep habits were associated with adolescents' sleep duration. Combined together, family environment and shared lifestyle should be taken into account in sleep research. Our previous study similarly indicated that co-sleeping potentially associated with negative effects on children's sleep hygiene and sleep problems [37]. Sleep arrangement, marked with ethnic, economic status, and sociocultural background characteristics, was more prevalent in non-western countries. The implication of sleep arrangement on psychosocial and physical development has not been definitively determined. Another study in Chinese adolescents revealed that adolescents and their parents had correlations in sleep/wake patterns, perceived sleep need, and insomnia symptoms [38]. All these studies revealed a close linkage in sleep behaviors between adolescents and their parents, though the intrinsic underlying mechanisms have not been clearly interpreted.