Coming form an equity market, I have never heard of this term. Is there a disadvantage that comes with 'roll over' when trading forex ? I am doing a demo, and I just learned about this new buzz word. I am willing to risk few pips in loss...but I am not shure how the roll over will affect me. I am googling this term...but I like elite traders way of explaining things. as an example lets say I am long eur 1.2234 , and short euro 1.2231, and heeere comes roll-over. Now what ?