Usually my most productive days are when work asks if I want to take a day off due to low work volume, and I utilize the day for something else.

Before at my previous job, I lived locally, and could do a lot of stuff but now I commute to my job, and usually don't get home until really late.

Today, I took the day off to focus on something, and I did something but not as much as I intended to do but better than not doing anything.