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Average slow wave activity [SWA; mean ± standard deviation (SD) first 27 min of artefact-free epochs of non-rapid eye movement (NREM) sleep] for nap conditions (top row) and developmental stage (bottom row). *indicates significant differences between age groups (2, 3, 5 years; top row) and nap conditions [morning nap (MN), afternoon nap (AN), evening nap (EN); bottom row].
