Interestingly, while Sabbath, with a capital S, refers to a specific day meant for rest after a week of labor, and can mean Saturday or Sunday, or whatever day your religion has set aside for a day of rest - with a small "s", sabbath simply means a period of rest.
So, let's put this into an interesting framework: remember your commandments? There's one in there about "Remember the Sabbath day to keep it holy." When was the last time that you thought about making a period of rest a holy activity? And yet, if you think about it - it's one of the commandments! Puts a bit of a different twist on this whole concept that "time" is "holy", doesn't it?
Also interesting is that the capital letter actually depends upon the translation you use. Hebrew, the language in which the Commandments were initially written, doesn't differentiate between capitals and small letters - proper nouns are dependent upon context. There isn't anything that indicates the word should be capitalized or lowercase.
So, assuming that you just experienced the same "oops" or "aha" moment I did, what are you going to do about it? This is Lent - the time for reflection and repentance (and if you actually follow the blog, we had something on what exactly is encompassed in repentance during Advent). How are you going to think of time differently? How will you take the Sabbath or the sabbath, and make it holy?