I fill a spreadsheet out of all my games with my Sr after the game, the map, and the heros I play. This spreadsheet auto inputs the time and a bunch of other things.

Two trends I found based on my playtime:

I've got a 10% winrate after 9pm. That's kinda crazy, it's a steep, steep drop off point for me I guess. I never noticed it, and I thought my drop off point was 11pm as that's when I've noticed I don't do quite well. Well that's true, I have a 0% winrate by 11 pm lol.

I have a ~20% winrate playing at ALL on the weekends. This is mostly due to my work schedule, as I work split shift and work mornings on weekends and evenings during the week. Turns out, if I have to wake up early, or play late at night, I'm absolutely garbage.

I highly suggest you all look into getting a spreadsheet to track your games and see if you notice any trends like this. Time of day does absolutely matter.