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This page is an AI-assisted Turkish summary of the study presented at the 26th World Congress of Psychiatry. The study belongs to the presenting authors; please refer to the original source when citing it.

EV0989

An ecological momentary assessment study examining the relationship between the functions of bedtime procrastination and smartphone use

AN ECOLOGICAL MOMENTARY ASSESSMENT STUDY EXPLORING THE RELATIONSHIP BETWEEN FUNCTIONS OF BEDTIME PROCRASTINATION AND SMARTPHONE ENGAGEMENT

Among young adults who engage in bedtime procrastination, greater daily positive social interaction is associated with lower objectively measured smartphone screen time, while at the between-person level, negative affect and lower reward satisfaction predict longer screen time.

The study aimed to examine the relationship between the psychological functions served by bedtime procrastination (BP) and objectively measured smartphone use in everyday life. Seventy-seven young adults (mean age 22.2 ± 2.46; 85.7% female) with a Bedtime Procrastination Scale (BPS) score of 33 or higher were monitored for seven days using ecological momentary assessment (EMA). Measures included the daily DABS (Diary of Ambulatory Behavioral State), covering emotion regulation and social interaction domains, a laboratory-developed question assessing subjective reward satisfaction, and total daily screen time obtained from the phone’s built-in screen time log; analyses were conducted using multilevel modeling (MLM) in R 4.5.2. At the within-person level, greater positive social interaction on a given day was significantly associated with lower total screen time on the same day (β = -0.084; SE 0.030; t = -2.797; p = 0.005; 95% confidence interval -0.143 to -0.025); within-person coefficients for positive affect, negative affect, negative social interaction, and reward were not significant. At the between-person level, higher negative affect predicted longer screen time (β = 0.320; SE 0.118; t = 2.724; p = 0.006), greater positive social interaction predicted shorter screen time (β = -0.233; SE 0.097; t = -2.411; p = 0.016), and, as reported in the poster, lower reward satisfaction predicted longer screen time (β = 0.370; SE 0.128; t = 2.881; p = 0.004). The authors suggest that fulfilled social needs may reduce the need for social interaction via smartphone before bedtime, whereas low reward satisfaction and negative affect may be associated with using the phone as a means of obtaining rewards and regulating emotions. The findings indicate that the relationship between the functions of BP and smartphone use differs at the within-person and between-person levels.

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