Better-than-average sleep predicted decreased state impulsivity while drinking, which indirectly predicted fewer negative alcohol consequences via lighter drinking quantity in young adults during naturally occurring drinking episodes.
Key Findings
Results
Higher morning readiness to start the day predicted decreased lack of premeditation while drinking, which indirectly predicted fewer negative alcohol consequences via lighter drinking quantity.
This finding emerged from multilevel mediation models using ecological momentary assessment data collected over 21 days
The mediation pathway ran from sleep quality (morning readiness) → state impulsivity (lack of premeditation) → drinking quantity → negative alcohol consequences
Morning readiness also predicted fewer negative consequences via lighter drinking quantity above and beyond state impulsivity while drinking
Sample consisted of N = 131 young adults
Results
Longer sleep duration predicted decreased sensation seeking while drinking, which indirectly predicted fewer negative alcohol consequences via lighter drinking quantity.
This was one of two supported mediation pathways out of four multilevel mediation models tested
Each model tested a different facet of impulsivity: urgency, lack of premeditation, lack of perseverance, and sensation seeking
The pathway involved sleep duration as the sleep predictor variable specifically for the sensation seeking facet
Findings were unchanged when accounting for cumulative sleep debt, except for the relation between morning readiness and sensation seeking while drinking
Results
Increased urgency while drinking indirectly predicted more negative alcohol consequences via heavier drinking quantity, but urgency was unrelated to sleep.
Urgency was one of four impulsivity facets measured during drink initiation and follow-up reports
Unlike lack of premeditation and sensation seeking, urgency was not predicted by any sleep variable tested
This suggests urgency operates as an independent risk factor for alcohol-related harms during drinking episodes, not mediated through sleep
The indirect effect ran through drinking quantity as a mediator between urgency and negative consequences
Methods
The study used ecological momentary assessment over 21 days to capture sleep, impulsivity, and drinking behavior in real-world contexts.
Participants completed morning reports, self-initiated drink reports after their first drink, and follow-up drinking reports at 60 and 120 minutes later
Past-day drinking quantity, negative alcohol consequences, and sleep (duration, nighttime awakenings, and morning readiness to start day) were measured each morning
Impulsivity was measured using four facets: urgency, lack of premeditation, lack of perseverance, and sensation seeking
N = 131 young adults participated in the 21-day protocol
Results
The mediation findings were largely unchanged when accounting for cumulative sleep debt, with one exception involving morning readiness and sensation seeking while drinking.
Cumulative sleep debt was included as a covariate in sensitivity analyses
The relation between morning readiness and sensation seeking while drinking was the only pathway affected by accounting for cumulative sleep debt
All other significant mediation pathways remained intact after this adjustment
This suggests the within-person effects of sleep on impulsivity are mostly independent of accumulated sleep debt
Results
Lack of perseverance while drinking was not supported as a mediator between any sleep variable and alcohol outcomes.
Four separate multilevel mediation models were tested, one for each impulsivity facet
Only two of the four models (lack of premeditation and sensation seeking) showed supported mediation pathways
Lack of perseverance did not emerge as a significant mediator linking sleep to drinking outcomes
This indicates that not all impulsivity facets function equivalently as mechanisms between sleep and drinking behavior
What This Means
This research suggests that the quality of a person's sleep on a given night influences how impulsive they feel while drinking alcohol later, and that this change in impulsivity helps explain why people who sleep better tend to drink less and experience fewer alcohol-related problems. The study tracked 131 young adults over three weeks using smartphone-based surveys, asking them each morning about their sleep and any drinking from the night before, and prompting them during actual drinking occasions to report on their impulsivity and alcohol use in real time. When participants felt more rested and ready to start their day, or when they had slept longer than usual, they reported lower levels of specific types of impulsivity—particularly acting without thinking things through and seeking out thrilling experiences—while drinking, which in turn was associated with drinking less and having fewer negative consequences.
The study found that not all types of impulsivity are equally connected to sleep. Two specific facets—lack of premeditation (acting without thinking) and sensation seeking (craving excitement)—were the ones reduced by better sleep and linked to safer drinking behavior. A third facet, urgency (acting rashly in response to strong emotions), was also associated with heavier drinking and more negative consequences, but it was not influenced by sleep quality, suggesting it operates through a different pathway. A fourth facet, lack of perseverance, did not show a significant role in any of the pathways tested.
This research suggests that improving sleep health in young adults could be a practical way to reduce impulsive decision-making during drinking occasions and ultimately lower the risk of alcohol-related harms. Because the data were collected during real drinking episodes rather than in a laboratory, the findings reflect how these processes actually unfold in everyday life. The authors suggest that sleep interventions—programs designed to help people sleep better—may be worth exploring as a strategy for reducing risky drinking behavior.
Waddell J, Wycoff A, Miller M. (2026). Impulsivity as a dynamic mechanism linking young adult sleep and drinking behavior during naturally occurring drinking episodes.. Drug and alcohol dependence. https://doi.org/10.1016/j.drugalcdep.2026.113054