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Updated: Aug 29, 2025

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
Published on: April 7, 2020
Sleep patterns, sluggish cognitive tempo, and daytime sleepiness - a commentary on Fredrick et al. (2022)
Dena Sadeghi-Bahmani1, Serge Brand2,3,4,5,6
1Department of Psychology, Stanford University, Stanford, CA, USA.
Abstract:
Fredrick et al. (Journal of Child Psychology and Psychiatry, 2022) showed in their cross-sectional and observational study that higher Sluggish Cognitive Tempo (SCT) traits were associated with more impaired subjective and objective sleep parameters. Importantly, data were gathered from adolescents and their parents, thus, enhancing the validity of the findings. In addition, the observed pattern of associations was unrelated to ADHD traits, age, sex, medication, or pubertal development. In the present commentary, we acknowledge the scientific value and practical and clinical implications of these findings. For future studies, we propose seven research avenues, which might help to further clarify the neurophysiological, psychological, and behavioral associations between SCT traits and sleep patterns.
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