The Origins of the Dark-Hyperactivity and Negative Peer Relationships, an Objectively Lower Sleep Efficiency, and a Longer Sleep Onset Latency at Age Five Were Associated with Callous-Unemotional Traits and Low Empathy at Age 14.

Correlative computations showed that a higher objectively assessed sleep efficiency and a shorter sleep latency at age five were associated with lower scores for callousness at 14 years (confirmation of Hypothesis 2; though, we noted that the objective sleep dimension did not reach statistical significance in the regression model).

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