Definitely at night. I also now have a dedicated workspace that's my combination office and jewelry studio. No one comes into this place unless I expressly invite them, and I can barely even hear outside noises. With this space, I can be as productive during the day as I am during most nights. That said, night is ALWAYS effortless for me, and I'm always sad to stop and go to bed just because the kids will be up in a few hours.