Don't you think that it might just have been because you were used to being in the office, worked one day from home, so didn't really manage to get into the spirit of work because it felt like a holiday? Would it not have been different if you worked from home full time, could have got yourself into a proper routine, and worked specified hours that you could stick to? I'm just keeping everything crossed that this works for my team, because cutting out the cost of the office would mean that I could afford to pay them more, which I'm sure they would be very happy with.
You might have something in that theory, to be honest. On the rare day that I worked from home I also had this feeling, and I do think that you're right in that it did feel like I was just on holiday, and I couldn't get into the habit of actually working properly. If you're always doing it, especially if you have a completely separate room in the house to use as your office, then it would be a lot easier to get into the swing of things, I think.