~snip~
I would agree with you that one should not gamble when one is tired. I would also like to add that when a person is in a state of mind that can affect their gambling such as putting you in a rush situation, or forcing you to make a hasty decision. Because at this time, gambling is based on emotions and it can bring big losses.
This can be very risky when you gamble with too much emotion, with this you are just putting yourself on a situation that you might not be able to leave without losing the money. If you are not feeling well better not to gamble and prioritize your health because losing the money might be one of the reason for you to feel more tired and depression can also happen because you are emotionally vulnerable.