I have this problem, as well. I've always assumed it was because I'm naturally a hard-working person, but am also generally very overwhelmed. I try my hardest when in public to live up to what I am supposed to do the very best that I can. (So, I work hard at work.) I would LIKE to do this at home, too, but, my home is also my "safe place," where I don't feel obligated to live up to expectations of what I should be doing. When I walk in the door of my home, I kind of go into "safe place" mentality, and allow myself to let down walls and experience emotions/how overwhelmed I am, very suddenly. Obviously, this isn't very conductive to getting things done. So I wind up spending all of the time that I'm home recuperating and recharging. But, on the rare occasions that I don't feel like I have to spend being home to do this (or when I discover that the state of my home is more overwhelming to me than whatever it is I'm trying to recover from) I automatically go into "non-lazy" mode, taking care of everything and working very hard on my home.
TL;DR? Home is safe place. At work, first priority is work, second priority is stealing a moment here and there for rest. At home, safe place, first priority is rest, second priority is work on home.
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-- Wherever you go, there you are. --
Your AQ Test Score is: 41 EQ: 17
Aspie score: 148 of 200 NT score: 51 of 200 // RAADS-R: 186