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Experimental design: an example protocol for a child with a 20:00–07:00 nighttime sleep schedule and a habitual 13:00 daytime nap opportunity (≥12.5 h total time in bed). Experimental nap assessments with varying prior wakefulness time [morning nap (MN) at 11:00, afternoon nap (AN) at 14:00 evening nap (EN) at 17:00] were ordered randomly and occurred on non-consecutive days.
