Exactly your mind should be at rest so you don't alter your experience while gambling,yes often times alot of gamblers may want to gamble when they are in distress but it's a wrong choice to think of as it may seem like your planting on a ground that's not fertile.
We ll know that when placing bets and gambling we need to enjoy every bits of the game as it may leads to big wins but sometimes some gamblers neglect the fact as they make up decisions when they are tired and even place bets when they are not in a right frame of mind and what do they get,an alterations in their winnings,do it's not advice to make or place bets when tired.
While gambling is a hobby and as such it could be an activity that we do to relax ourselves precisely when we are stressed out, gambling under such an emotional state is a bad idea as gambling is one of the few hobbies in which you use money directly to get your fun, which could cause you to take a series of decisions that you could later regret and make you lose way more money than expected, and instead of getting the relaxation you wanted, you just get even more stressed as a result.