I'm concerned that my play schedule affects my performance

I can only play in the morning and late at night. I'm pretty tired at both times and not really up speed either. Even if I start to play well or have a good game, I can't use it as a jumping off point as I'm out of time. On days off I pretty much spam ranked but after troll games or exhausting games, I don't think I exactly play my best either. Especially if I drop a few games, it's pretty tilting and the game just becomes a matter of going through the motions.

To me, it seems like the best method is to maybe get 3-4 games in during decent hours and either call it a day or take a break for a few hours.

What does everything think is the optimal schedule for playing?