In short, yes it does. Sunlight is very effective at charging glow in the dark material. However, you need to remember that glow in the dark materials often run out of charge during sunset. Many folks leave glow in the dark materials outside and expect them to glow throughout the night. The sad truth is that the glow is emitted continuously, and as the sun sets, it is being emitted. As the partial light period often extends several hours, you can easily run out of charge before nightfall.