Yesterday was great. Sure, I wasted time on something unimportant, but I was completely focused on that task, which is a start. And, generally speaking, I felt a lot of energy and focus throughout the day.
Today feels okay. I have been productive so far. But I haven't planned my day, which I need to do to make sure I don't spend too long on any given task. As the psychiatrist who prescribed Concerta said, medication can't make decisions for me. That's my job.
But I can confirm that sleep helps a lot. I'm pretty sure that more sleep (slept 7 hours) would have given me even more energy and focus. Although, this is true regardless of Concerta's influence.