Night-time screen-based media device use and adolescents' sleep and health-related quality of life.
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Abstract
OBJECTIVE The present study investigates the relationship between night time screen based media devices SBMD use which refers to use within 1 h before sleep in both lit and dark rooms and sleep outcomes and health related quality of life HRQoL among 11 to 12 year olds METHODS We analysed baseline data from a large cohort of 6616 adolescents from 39 schools in and around London United Kingdom participating in the Study of Cognition Adolescents and Mobile Phone SCAMP Adolescents self reported their use of any SBMD mobile phone tablet laptop television etc Sleep variables were derived from self reported weekday and or weekend bedtime sleep onset latency SOL and wake time Sleep quality was assessed using four standardised dimensions from the Swiss Health Survey HRQoL was estimated using the KIDSCREEN 10 questionnaire RESULTS Over two thirds 71 5 of adolescents reported using at least one SBMD at night time and about a third 32 2 reported using mobile phones at night time in darkness Night time mobile phone and television use was associated with higher odds of insufficient sleep duration on weekdays Odds Ratio OR 1 82 95 Confidence Interval CI 1 59 2 07 and OR 1 40 95 CI 1 23 1 60 respectively Adolescents who used mobile phones in a room with light were more likely to have insufficient sleep OR 1 32 95 CI 1 10 1 60 and later sleep midpoint OR 1 64 95 CI 1 37 1 95 on weekends compared to non users The magnitude of these associations was even stronger for those who used mobile phones in darkness for insufficient sleep duration on weekdays OR 2 13 95 CI 1 79 2 54 and for later sleep midpoint on weekdays OR 3 88 95 CI 3 25 4 62 compared to non users Night time use of mobile phones was associated with lower HRQoL and use in a dark room was associated with even lower KIDSCREEN 10 score 1 18 95 CI 1 85 0 52 compared to no use CONCLUSIONS We found consistent associations between night time SBMD use and poor sleep outcomes and worse HRQoL in adolescents The magnitude of these associations was stronger when SBMD use occurred in a dark room versus a lit room