"I woke up as any other usual day, but my spirit was high. After a long period of non-stop, vigorous working, I finally could relax, as it was the day of rest I deserved after working so hard." Now, the hearer can identify which day of rest you are talking about. And only now are you being "very definite" about which day of rest you are talking ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.