First of all, it is said that you can't drink overnight tea. It is because the tea that ancient people in China drank was stored in the open air, and there were many dust and flying insects (including cockroaches and mice), which were likely to pollute the tea. So to put it bluntly, whether tea can be drunk depends mainly on whether it has deteriorated. If the color is opaque and turbid, you can't drink it. If you have long white hair, you can't drink. Otherwise, you can drink tea all night, unless you are obsessive-compulsive and neat.