My peak is when I have to go to bed and the next day I have something very important to do, for which I have to be well-rested.
I'll literally be preparing to go to bed when suddenly an idea pops in my head for a fix/improvement on a project I've been working on.
Four hours and a few git branches later, I kick back with a smug sense of accomplishment and...realize I have to be up in two hours.
Meanwhile, I can block out literally an entire saturday afternoon to work on projects, but usually I just can't seem to catch that same random spark that only seems to strike at like 1am on a Wednesday. I get things done, but am not nearly as razor focused. Maybe its because I planned it out, maybe I just work better late at night, who knows.
I want to capture that spark and place it in a bottle right next to my desk.