1. Overnight position refers to holding a contract position in the futures market until the next trading day. Futures trading allows traders to freely choose whether to hold positions overnight, which depends on their investment strategies, risk tolerance and personal preferences.

2. Holding positions overnight may face some risks, such as changes in profit and loss caused by market fluctuations and overnight interest charges. The delivery date of futures contracts is also a factor to be considered, because contracts that hold positions before the due delivery date may require physical delivery or delivery.

3. For corn futures or any other futures contracts, open positions overnight, fully understand market liquidity, risk management strategies and related delivery rules before making a decision, and make risk assessment and investment decisions according to your own situation.