Epidemiological studies have shown that playing a computer game at night delays bedtime and shortens sleeping hours, but the effects on sleep architecture and quality have remained unclear. In the present study, the effects of playing a computer game and using a bright display on nocturnal sleep were examined in a laboratory. Seven male adults (24.7 +/- 5.6 years old) played exciting computer games with a bright display (game-BD) and a dark display (game-DD) and performed simple tasks with low mental load as a control condition in front of a BD (control-BD) and DD (control-DD) between 23:00 and 1:45 hours in randomized order and then went to bed at 2:00 hours and slept until 8:00 hours. Rectal temperature, electroencephalogram (EEG), heart rate and subjective sleepiness were recorded before sleep and a polysomnogram was recorded during sleep. Heart rate was significantly higher after playing games than after the control conditions, and it was also significantly higher after using the BD than after using the DD. Subjective sleepiness and relative theta power of EEG were significantly lower after playing games than after the control conditions. Sleep latency was significantly longer after playing games than after the control conditions. REM sleep was significantly shorter after the playing games than after the control conditions. No significant effects of either computer games or BD were found on slow-wave sleep. These results suggest that playing an exciting computer game affects sleep latency and REM sleep but that a bright display does not affect sleep variables. Read more...

Aim: To describe the use of media as a sleep aid in adolescents and relate this to their sleep routines and feelings of tiredness. Methods: A questionnaire about using media as a sleep aid, media presence in bedrooms, time to bed and time out of bed on average weekdays and average weekend days, and questions regarding level of tiredness in the morning, at school, after a day at school and after the weekend was completed by 2546 seventh and 10th grade children in a random sample of 15 schools. Results: Of the adolescents, 36.7% reported watching television to help them fall asleep. In total, 28.2% of the boys and 14.7% of the girls used computer games as a sleep aid. Music was used to fall asleep by 60.2% of the adolescents in this sample. About half of the adolescents read books to fall asleep. Except for reading books, using media as a sleep aid is negatively related to respondents' time to bed on weekdays, their number of hours of sleep per week and their self-reported level of tiredness. Conclusion: Using media as a sleep aid appears to be common practice among adolescents. Those who reported using music, television, and computer games more often as a sleeping aid slept fewer hours and were significantly more tired. Read more...