We try our very, very best not to. Like js250 said, it really depends on the argument, issue or problem. Sometimes, we'll be able to work it out completely (even if that means staying up till 3 or 4am) the same night. Other times we can't get it completely worked out the same night. At those times, we just rely on our love to get us through till the next day when we can deal with it.
Just like js250 said, sometimes we are feeling like we really don't like each other, but we still love each other. Some problems are just too big, too complicated, etc. to be able to solve in one sitting. But we can at least get to a point of peace, show our love for each other, and hang in there a bit longer. There are times where we have to say "I love you" and then grant each other our space for a bit.