Never play whilst tired, emotionally stressed or physically unwell for whatever reason. In short. if you are playing to win, never play unless you are at your best. Of course, if you are playing for entainterment or to gamble, you can play anytime you like.
Poker when played well against less-skilled players is NOT a gamble, although luck plays an important part in the short term, you will win in the long term if you play well against these players. Just as the casino will always beat you in the long term at roulette, craps, etc., in no matter what your short-term luck might be. You cannot beat maths.
