At this point, I stopped writing Math 53 and turned to answer this question for you. It's really touching.
In my opinion, the suitable time for doing math problems in a day is 9~ 12 in the morning, 2~ 10 in the afternoon and other special times.
(that is, when awake. )
My math teacher once said, "Don't do math on New Year's Eve. From now until New Year's Eve, I will do math and keep doing it. " . "←
Ex-dividend