The weekend has proved to be very relaxing. In fact, the seven or so weekends I've encountered since the start of my PhD have proved to be quite relaxing, because on the whole I've done very little in the way of work during them. I've been considering whether this is a good thing or not and, up until now, have yet to come to a final decision. As I see it, working relatively hard five days a week at this stage is acceptable, because it allows for the prospect of shifting up a gear or two in future when my project requires it.
I'm not sure if that is a justifiable position, but up until christmas, perhaps, it will be fine.