Self-control depletion and sleep duration: the mediating role of television viewing.

Objective: Sleep insufficiency has been related to self-control failure: people fail to go to bed in time and end up sleep deprived. The role of state self-control in predicting bedtime and sleep duration has not yet been investigated. Based on research claiming an overlap between depleted self-control resources and fatigue, self-control depletion may foster earlier bedtimes. Conversely, self-control depletion also increases the propensity to procrastinate bedtime by giving in to the immediate gratification of late night entertainment. This study therefore looked at procrastinatory television viewing and its intermediary role in the association between state self-control and bedtime. The implications for sleep duration are examined.

Design: Firstyear students (N = 234) participated in an online survey. Using Day Reconstruction Method, they charted their activities and experiences during the preceding day and subsequent bedtime behavior.

Results: Self-control depletion was directly related to earlier bedtimes, which we explained by its similarity to fatigue. This was associated with longer sleep duration. Self-control depletion was indirectly related to later bedtimes because it increased the propensity to procrastinate by watching television. This was associated with shorter sleep duration.

Conclusion: This study exposes a dual pathway between self-control depletion and sleep duration, whereby procrastinatory television viewing may reduce sleep duration.