You can't. The glutinous rice used for dumplings can be soaked in advance, but it may be too long overnight, which will affect the taste and quality of glutinous rice. Generally speaking, it is recommended to soak the glutinous rice for 4-6 hours in advance, or soak it for at least 2 hours, so that the glutinous rice can absorb enough water, become softer and easier to cook, and will not taste too waxy or sticky after cooking.