Preprocessed data used for further analysis.

The table reports the number of subjects for each age category with at least 4-min artifact-free wakefulness and sleep EEG, and the range of 2-s artifact-free epochs for each vigilance stage. The columns represent (from left to right): the age interval; the total number of subjects (); the number of subjects with at least 4-min artifact-free wakefulness EEG ( (W)); the number of subjects with at least 4-min artifact-free sleep EEG ( (S)); the number of 2-s artifact-free EEG wakefulness epochs per subject [min–max] (W epochs); the number of 2-s artifact-free EEG sleep epochs per subject [min–max] (S epochs).