Use of pre-workout dietary supplements is associated with lower sleep duration among adolescents and young adults

• Pre-workout dietary supplements are commonly used among young people. • Pre-workout dietary supplements have high levels of caffeine. • Use of pre-workout is associated with lower sleep duration among young people. This study aimed to investigate the association between the use of pre-workout dietary supplements and average sleep duration among adolescents and young adults. Data from Wave 2 of the Canadian Study of Adolescent Behaviors ( N = 912) were analyzed. Multinomial logistic regression analyses were conducted to investigate the cross-sectional association between the use of pre-workout dietary supplements in the past 12 months and average sleep duration in the past 2 weeks. Adolescents and young adults who reported pre-workout dietary supplement use were at greater risk (RRR 2.53, 95% CI 1.27–5.05, p = 0.09) of reporting ≤5 h of average sleep per night relative to 8 h of sleep. Findings underscore that the high caffeine content of pre-workout dietary supplements is associated with shorter sleep durations, which are well below the recommended guidelines for adolescents and young adults. Health and mental health care professionals should educate pre-workout users on the association between use and sleep.