ArticleJournal of sleep research2026
What Drives Girlfriends' Bedtimes? Experimental Effects of Social Technology Use and the Role of Friendship and Personality.
Article in Journal of sleep research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
1 citing paper in PubMed.
- What Drives Girlfriends' Bedtimes? Experimental Effects of Social Technology Use and the Role of Friendship and Personality.Journal of sleep research · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors.
Funding
Abstract
Technology use is often implicated in adolescent sleep difficulties, yet experimental evidence confirming its impact on bedtime is critically lacking. This study tested whether online socialising with friends delays bedtime compared to non-social online media use, while also considering the roles of friendship quality and personality. Seventeen pairs of female friends (N = 34; ages 16-18 years) spent two nights in a sleep laboratory: one night online socialising with their friend in another room (WhatsApp + Netflix), and one night watching Netflix alone without socialising. Condition order was counterbalanced across pairs. Bedtime was behaviorally observed using infrared cameras. The following morning, participants reported who initiated sleep and their reasons for going to bed. They also completed questionnaires on friendship quality, co-rumination, self-control, bedtime procrastination, and a sleep diary. Multilevel models accounted for the nested structure of repeated assessments within individuals within dyads. On average, participants went to bed later during online socialising than during non-social online use, although this difference was not statistically significant. However, higher friendship quality significantly predicted longer bedtime delays during online socialising, with delays up to 72 min. Feeling sleepy was the primary reason for sleep onset, rather than social motivations. Additionally, there were clear associations between self-reported sleep initiation and bedtime procrastination and behavioural observations of earlier and later bedtimes, respectively. These experimental findings suggest that online socialising may delay adolescent bedtimes, particularly among those with high-quality friendships. These results underscore the importance of addressing peer dynamics and individual differences in supporting healthy adolescent sleep.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.