Thus the heavens and the earth were finished, and all the host of them. 2 And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done. 3 So God blessed the seventh day and made it holy, because on it God rested from all his work that he had done in creation.
The Holy Bible: English Standard Version. (2001). (Ge 2:1–3). Wheaton: Standard Bible Society.
Labor and rest are two of the ordinances of the garden that carry over. The Sabbath rest is a big deal to God. Consider that Isaiah tells Judah that its people will be exiled for failing to honor the Sabbath. God carries over the Sabbath rest to the Ten Commandments.
It is an ordinance of creation that carries over to us. God rested and commands that we rest. It is for our good. We are to enjoy it. We do not enjoy it because the fall corrupted our programming and relation to God. But we should rest and we should do our best to ensure others are not having to labor for us as we rest.
This idea does not mean we sleep all day or avoid watching TV or avoid cooking. It does mean we spend a day communing with God and enjoying his creation, instead of working within his creation. It does mean we try not to make others work for us that day as well.
Our bodies and our souls need rest and God wants us to have it.