What rules should I be aware of?

Shorting is not available in the overnight session.
Only LIMIT orders are available. Market, Stop, Stop Limit and Trailing Stop orders are not available in the overnight session.
Fractional orders are not available.
Margin usage is not available in the overnight session. If your order’s dollar amount exceeds your Cash Buying Power, the order will be rejected.
Selecting overnight hours will ensure your trade is active between 8PM and 4AM EST.

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