Market Rollover pertains to the one-hour duration following the market's closure. Within this timeframe, spreads may experience volatile spikes, thereby posing significant challenges in maintaining positions. Typically occurring at 5 PM EST, it's important to note that closing positions is not feasible during this period.

On that note, Smart Prop Trader recommends closing your positions before the market roll-over, or alternatively, ensuring that your stop losses have adequate leeway to accommodate potential spread volatility. There is a high likelihood that your stop loss and take profit levels may not be honored in such circumstances.