I usually find I play better while the sun is shining, noon to late afternoon, most Casino's in the World will not have windows, so it is hard to tell what time it is, as they want you to keep on
gambling (and losing).
I don't remember who it was, but a top Professional in an interview was asked a similar question about where he prefers to play? In the USA or UK and his immediate response was definitely the USA, when asked why? he said there are more Casino's in the USA therefore more "Fish to fry".
I do not want to offend any American's but what he was actually referring to was the simple fact there are more people living in the USA so obviously more mediocre players around.
Choosing your time when to play can have an advantage,because if it is early in the day where you live, It could be late at night where other players live and therefore may have had a couple of beers, (or more).
So to make the best of that type of advantage, you have to experiment with Time Zones to find the optimum Time to play, for yourself, depending on where you live in the World.
Personally I don't want to spend my time, finding the best time for myself, I just want to have some fun.
When the fun Stops, STOP!