- Boredom is a ubiquitous human experience that most people try to avoid feeling. People who are prone to boredom experience negative consequences. This study examined the impact of individual differences in the ability to entertain the self (the internal stimulation factor) on boredom experiences during the COVID-19 lockdown in the United States. The internal and external stimulation factors predicted greater boredom frequency, boredom duration, and boredom intensity, each of which reflected a different aspect of emotional experience. The relationship among these factors was complex. A serial mediation analysis indicated the internal stimulation factor predicted the frequency of boredom, which in turn predicted the duration of boredom, which predicted boredom intensity. This pattern of relationships is potentially unique to boredom among emotional experiences. These findings provide insight into how boredom functions during a period in which daily activities and coping resources that would normally be available became severely limited.