Poor and insufficient sleep causes physical, cognitive, emotional, and social impairments. Unfortunately, little is known about the social‐cognitive predictors of daily sleep habits. The current study examined if sleep hygiene could be predicted using the Reasoned Action Model (Fishbein & Ajzen, ). Across four studies, the model performed well for the prediction of intentions (R2s = .63–.75), and also significantly predicted both self‐reported (R2 = .15) and actigraphy‐recorded sleep duration (R2 = .11). The results from these studies support the further use of the model toward the goal of designing effective sleep hygiene interventions.