A Comment on "Early morning university classes are associated with impaired sleep and academic performance"

Yeo et al. (2023) examined the relationship between early university classes, and sleep and academic performance in a large-scale observational study. They hypothesized lower attendance, shorter sleep, and poorer academic achievements coming with earlier classes. To test their hypotheses, the authors tracked students' Wi-Fi connections, Learning Management System logins, and grades and collected actigraphy data. In line with their hypotheses, they found that earlier classes predicted lower attendance, grades and shorter sleep. Due to inaccessibility of other data, this reproduction project focuses solely on the actigraphy data. Here, the authors found that students attend earlier classes to a lower degree since they tend to oversleep, that the frequency of naps is associated with earlier class start times, and that students sleep shorter on nights preceding earlier classes. In this recreate reproducibility project, which uses partly cleaned data, all these claims are successfully reproduced. However, there are some numerical inconsistencies of unclear origin in some results.