Personally, I think that every type of investor should earn his own money. Short-term day traders should never hold positions overnight. People in the middle line can hold positions. First of all, you should look at the price and transaction situation in the last hour and evaluate the settlement price. Then judge the trend of opening tomorrow. Personally, short-term investors holding positions overnight is equivalent to gambling. Because you don't know what will happen at night. The direct cause of the sharp drop in the opening of stock index futures on May 7 may be the sharp drop in the US stock market the night before. But this thing is not what you can expect. As a short-term investor, do you close your position at a loss or hold it for longer?