After the white fungus is cooked, it can be eaten overnight in the refrigerator. However, you need to pay attention to the following points:

1. Ensure the freshness and hygiene of the ingredients. Use clean pots and water sources when cooking Tremella fuciformis, and clean the Tremella fuciformis.

2. Store it in the refrigerator promptly after cooking. Avoid storing it at room temperature for too long to avoid bacterial growth and deterioration.

3. Take out the white fungus before eating it overnight, and then heat or cook it to ensure it is cooked thoroughly and avoid eating raw white fungus.

4. If the Tremella fuciformis has been stored for too long or is found to have deteriorated, smelly, discolored, moldy, etc., it should be discarded immediately to avoid food poisoning or other health problems caused by consumption.