1377: When Do Larks and Owls go the Extra Mile? The Impact of Chronotype on OCB via Time Extension Self-Efficacy (18278)

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In this research, we investigate the effects of chronotype on individuals’ perceived ability to extend their available time of day and their engagement in OCB. Drawing upon the self-efficacy theory and the circadian process theory, we theorize that individuals’ wake time and bedtime experiences associated with their chronotypes shape different beliefs in their capability to extend their morning and evening by changing their sleep timing (which we call time extension self-efficacy). We suggest that these efficacy beliefs influence individuals’ OCB engagement in the morning and evening since perceived time availability plays an important role in individuals’ decisions to engage in discretionary extra-role behaviors. We tested these predictions across two studies. In Study 1, we found that individuals with earlier chronotypes (i.e., morning people) showed stronger confidence in extending their morning by advancing their wake time, which led to higher OCBI engagement in the morning. In contrast, individuals with later chronotypes (i.e., evening people) showed stronger confidence in extending their evening by delaying their bedtime, leading to higher OCBI engagement in the evening. In Study 2, we replicated these findings and found similar patterns for OCBO. We conclude by examining the theoretical and practical implications of these discoveries and suggesting potential avenues for

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