Use of gadgets near bedtime leads to daytime sleepiness, poorer self-satisfaction
Individuals who usually use screen media, such as smartphones and tablets, near bedtime have shorter valid sleep time, resulting in daytime sleepiness and worse self-satisfaction, suggests a China study.
“Screen media use near bedtime has been shown to impact sleep quality adversely, and may lead to the compression of sleep duration,” the investigators posited.
The survey involved 3,639 healthy college students (mean age 19.6 years). Data collection was done through paper-pen questionnaires. Hierarchical linear regression was used to examine the associations between total usage of light-emitting electronic equipment before bed (TU-LE), sleep indices, daytime sleepiness and self-satisfaction.
Sleep indices were total sleep time (TST), sleep onset latency (SOL) and valid sleep time (VST), while self-satisfaction was represented by health satisfaction, study satisfaction and sleep satisfaction.
TST had a range of 6.0–7.9 h (mean, 7.1 h) and SOL varied from 0.1–0.5 h (mean, 0.3 h), while the difference between TST and SOL was the VST. Results of the regression suggested that TU-LE could predict daytime sleepiness level positively and VST negatively, while VST could predict daytime sleepiness level positively.
There was still a statistically significant association between TU-LE and daytime sleepiness even after controlling for VST. Additionally, TU-LE predicted positively and VST negatively the three components of self-satisfaction. After controlling for VST, TU-LE still predicted the components of self-satisfaction.
“These findings suggest that individuals reporting higher quantity of TU-LE had shorter valid sleep time, leading to worse daytime performance and self-satisfaction evaluation,” the investigators said. “Sleep education should take into consideration the cumulative effect of TU-LE.”