Trait neuroticism, time of day, and day of the week were assessed as predictors of state fatigue. After completing an in-lab questionnaire, 176 participants (N = 176) reported their state subjective fatigue three times a day for 8 days. Trait neuroticism was shown to be a predictor of subjective fatigue states in the morning, early evening, at bedtime, and over the course of the 8-day study period. Additionally, results indicated statistically significant differences in subjective fatigue at different points in the day. A statistically significant Neuroticism X Day of the Week interaction indicated that the neuroticism -fatigue relationship was strongest on Tuesday and weakest on Sunday. The relative contribution of personality, time of day, and day of the week variables to state subjective fatigue are discussed.

The relationships between procrastination, self-regulation, and fatigue were assessed. Previous researchers have suggested that procrastination is positively related to fatigue (Gropel&Steel, 2008), and that the use of self-regulation results in higher levels of fatigue (Muraven, Tice,&Baumeister, 1998). In the present study, I proposed that self-regulation is the mechanism underlying the relationship between procrastination and fatigue. Undergraduate students (N=110) first completed an in-lab questionnaire, then completed 15 online questionnaires per week for three weeks. The online questionnaires assessed sleeping and waking habits, along with reports of state fatigue. Procrastination was assessed through the time spent putting off getting out of bed each morning. Participants were split into two groups, and the experimental group was instructed to use an alarm clock without a snooze button during Week 2. Three findings were of interest. First, in contrast to global, self-reported behavior, aggregated measures of daily self-reported procrastination indicated a positive relationship with trait measures of procrastination, suggesting that global self-reports of behavior delay should be interpreted with caution. Second, trait procrastination was found to be a significant predictor of the amount of time spent delaying getting out of bed in the morning; however, the amount of time spent delaying getting out of bed in the morning was not predictive of subjective morning or afternoon fatigue. Finally, partial support was provided for a relationship between trait procrastination and state fatigue after accounting for other variables which have been shown to predict state subjective fatigue (e.g., neuroticism and anxiety; Ackerman, Kanfer,&Wolman, 2008). Based on these findings, I suggest that a stronger relationship exists between procrastination and fatigue at the trait level than the state level, and the state-level relationship may operate through a mechanism other than self-regulation.

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