I'm most relaxed and able to concentrate in really comfy environments. Late nights, after everyone else is asleep, I'll throw my headphones on and get to work, and pretty much zen out until 3AM or so. Nice cool-weather days, where I can open up the windows and turn off the a/c make me feel really relaxed as well. I just really hate crammed office environments. That's part of the reason why I just code/design as a side gig on my own time and mostly for my own personal projects and for friends.