The suicidal feelings, self-injury, and mobile phone use after lights out in adolescents.
OBJECTIVE
To study association between nocturnal mobile phone use and mental health, suicidal feelings, and self-injury in adolescents.


METHODS
Associations of mobile phone use after lights out with mental health, suicidal feelings, and self-injury were cross-sectionally examined in 17,920 adolescents using a self-report questionnaire. A series of logistic regression analyses were separately conducted for early (grades 7-9) and late (grades 10-12) adolescents.


RESULTS
Sleep length was significantly associated with the mobile phone use only in early adolescents. Logistic regression showed significant associations of the nocturnal mobile phone use with poor mental health, suicidal feelings, and self-injury after controlling for sleep length and other confounders.


CONCLUSIONS
Mobile phone use after lights out may be associated with poor mental health, suicidal feelings, and self-injury in both early and late adolescents. Association between reduced sleep and the mobile phone use was confined to early adolescents.
Office for Mental Health Support, Division for Counseling and Support, The University of Tokyo.
Norihito
N
Oshima
Atsushi
A
Nishida
Shinji
S
Shimodera
Mamoru
M
Tochigi
Shuntaro
S
Ando
Syudo
S
Yamasaki
Yuji
Y
Okazaki
Tsukasa
T
Sasaki
D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D040421:Cell Phone; D003430:Cross-Sectional Studies; D004644:Emotions; D005260:Female; D006801:Humans; D008297:Male; D008603:Mental Health; D016728:Self-Injurious Behavior / Q000523:psychology*; D059020:Suicidal Ideation; D011795:Surveys and Questionnaires