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Description: This contains the files used in the two articles "Actimetry in infant sleep research: an approach to facilitate comparability" https://doi.org/10.1093/sleep/zsz083 and "Which are the Central Aspects of Infant Sleep? The Dynamics of Sleep Composites across Infancy" doi will be added. The first article compares to commonly used algorithms (Sadeh et al. 1994 and Oakley 1997) and shows that without adjustment the estimated sleep variables are quite different but by introducing a set of adjustments they become quite similar and also more similar to a parent-reported diary. The second article describes how you can extract sleep composites from the actigraphy data and how these sleep composites change across infancy.