Sunday morning blues
In essence it means that Saturday, which occupied the distinction of being the most hated day in the week, will now pass that honour to Sunday. Those in the outside world, that is, anyone outside the Middle East will find it quite puzzling to see Sunday land in the same boat as Monday, but this is something we will be getting used to as well.
On the other hand, we've been so used to Thursday-Friday being our weekend that, it's likely that it'll take sometime for us to make a clean break and start accepting the new scheme of things. So till then, we'll continue thinking of Thursday as a rest day and Wednesday as the precursor to that much loved rest day, and as a result, there are less chances of large scale crankiness in the office because everyone would be more relaxed. Obviouslly, I'm being horribly idealistic because human nature usually finds a way to express its cranky side. But I shall remain hopeful, and till then, we'll have to sing the Sunday morning blues in unison.