Objective: In order to explore the influence of boredom proneness on the bedtimeprocrastination behavior of college students from institute of nationalities and the mechanism betweenproblematic social media use and sensation seeking. Methods: The study recruited 1053 college studentsfrom institute of nationalities to complete Bedtime Procrastination Scale, Boredom Proneness Scale-Short Form, Problematic Social Media Use Scale, and Sensation Seeking Scale. For data analysis,common method biases were examined at first. Then, correlation analysis was conducted to obtainthe relationship between variables among the hypothesized model. All analyses were carried out usingSPSS 27.0 and PROCESS 4.0. Results: The results indicated that: (1) Boredom proneness positivelypredicted college students’ bedtime procrastination from institute of nationalities(r=0.604, p<0.01).(2) Problematic social media use partially mediated the relationship between boredom proneness andbedtime procrastination(β=0.281, p<0.01), accounting for 25.41% of the total effect. (3) Sensation seekingmediated the relationship between boredom proneness and problematic social media use(β=0.089,p<0.01). Specifically, high Sensation seeking could increase the impact of boredom proneness on theproblematic social media use. Conclusion: Our results suggest that boredom proneness increases the riskof bedtime procrastination through problematic social media use, and that sensation seeking increasesthe effect of boredom proneness on bedtime procrastination.