Satisfaction.
When I trade, I don't want to be aware of any distracting needs.
Not being hungry is number one. So I eat a moderately unhealthy breakfast, biscuits and gravy is nice.
Not being horny is number two. So I try to sneak in a morning quickie about three hours before the market opens. The drowsiness wears off, but the satisfaction remains. A boner is a wonderful gift, but not while you're trying to trade.
Number three, during RMH, I don't want to feel anxious. So setting some fruits and cookies and chips and dip and nuts and cheeses and meatsticks and crackers nearby is essential. I get pissed easily (at myself and at the market), so rather than biting the monitor I snack.
Number four, I play classical music. KDFC over the web is my favorite, and it has the side benefit of alerting me to connection failure if it goes quiet.
Perhaps you all are very brave during RMH, but I tend to get rattled easily, so I want maximum comfort.