Too long for a comment... All the answers here (even the outliers, I think) are essentially honest accounts of how people deal with "the week", and the peculiarities of the rhythm it may suggest for our lives.
Of course, if the real question is "how do I get myself to systematically behave in a way I don't want to...?", then the answer is either that it's not sustainable, or "change yourself". :)
My own choice, for many reasons, has been to try to avoid thinking in terms of this entirely conventional (though universal) description of human activity: workdays, weekends, holidays, vacations. This was obviously easier when I had no kids, and no partners involved in conventionally-scheduled lives. But even in, and if one looks carefully, almost because of, the throes of small-children exigencies (maybe more severe than almost everything else), one can remind oneself that the conventional description of weeks and days is purely conventional.
So let's be philosophical: what does one want, (versus) what does one need? At one extreme, trying to force oneself to be more "virtuous" than one's natural inclination (at any particular point in life) seems at least partly misguided, although nudges in various directions are obviously part of a developmental process.
If the question is "how to overcome practical things getting in the way?", well, this has nothing to do with weekends, all the more since many academics can "work from home" (!!!) whenever no trip to campus is necessary. My own faux-rationalization is that doing laundry or washing dishes is a better "cigarette break" than actually smoking, although we all should know that it's easier and more fun to be addicted to an addictive thing than to non-addictive tasks. :)
In that vein, whenever one finds oneself trying to coerce oneself into something against (part of) one's will, one should... consider. By this year, I think the key point is to not make plans that commit you to be something you don't want to be, especially in terms of what it involves day-to-day.
For myself, I try to integrate practical tasks with "my work". "Breaks" from long-term not-immediately-gratifying projects are to take care of (immediately gratifying?) tasks such as folding laundry, paying bills, exercising (relatively fun!), going to the grocery, taking care of house/lawn/whatever...
Still, if one really doesn't care about the "research project", it'll be a good trick to make it stay in one's head. On the other hand, caring a bit too much does keep one awake at night... but maybe it's an adventure?