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Elevated bedtime at Wave 2, relative to a person’s usual patterns, was associated with elevated bedtime at Wave 3 (β=.20, 95% CI 0.05-0.36; P
Age significantly predicted the intercepts of screen time (β=.21, 95% CI 0.16-0.25; P
Estimated parameters of the random intercept cross-lagged panel model (RI-CLPM) testing between- and within-person associations of screen time, bedtime, and daytime sleepiness across 3 measurement waves in a longitudinal study of adolescents (aged 11-16 years) conducted in the Czech Republic
J Med Internet Res 2026;28:e78972
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While the number of people who tend to use apps at bedtime is rapidly increasing [31,32], specific research focusing on bedtime app usage is limited, and the efficacy and mechanisms of such bedtime practice are unknown. In fact, bedtime screen use is often discouraged with typical sleep hygiene strategies. Many apps now target sleep difficulties and have begun to incorporate sleep-specific content but the research is deficient.
JMIR Form Res 2025;9:e67366
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Estimation of Bedtimes of Reddit Users: Integrated Analysis of Time Stamps and Surveys
The model is then applied to the application set, the remaining 50,000 users for whom time zone data but not bedtime data are available.
For model training and testing, we required information about Reddit users regarding their average bedtime and time zone of residence. A Reddit ad was placed asking adult volunteers to complete a Qualtrics survey (Qualtrics International Inc) regarding their Reddit username, typical bedtime, range in bedtime, country, and state of residence.
JMIR Form Res 2023;7:e38112
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In particular, parental rules around bedtime affect youth sleep behaviors and sleep duration [36-38]. Specific behaviors or rules around digital media, particularly around bedtime, may buffer the potential negative effects of social media on daytime sleepiness among adolescents. Indeed, one study found that parents’ rules about technology use at bedtime were associated with an earlier bedtime for adolescents [39].
JMIR Ment Health 2021;8(9):e26273
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