This study used daily experimental data from smart bands worn by 142 respondents to investigate the relationship between the number of minutes slept and self-reported mood. The results showed that more minutes of sleep were associated with improved mood. Time preferences, altruism, and trust were also associated with mood. Finally, our analysis revealed that the only mechanism through which sleep affects mood is positive reciprocity. This study contributes to the existing literature by examining the connections among healthy habits, sleep quality, economic preferences, and their effects on mood.