You are right mate. A gambler is not supposed to gamble when they are not mentally prepared for such activity because it can result to loses even in a situation where they are not supposed to lose. Gambling do with mental and emotional readiness, if someone is not prepared for such activities, they can never performan well and can never catch the fun they have even wanted to archive.
And when can you say that someone is emotionally ready to gamble? Because there are times when you can just be stressed out due to a busy day or the long distance covered by driving,
or anything else that could lead to the person getting tired but doesn't necessarily affect his mind or way of thinking.
Aside from the fact that he needs some rest, such a person can relax. Why could receiving air and placing a few bets in gambling be considered such behaviour as the person not being ready??