I do strongly believe in the Sabbath (Shabbat), the day God gave us for resting. One day every week, it's good to make the conscious choice to not work, talk about problems or talk about future plans. Do something peaceful that gives you joy, thank The Lord for letting you rest.
If you follow it religiously, it's gonna be from Friday 6:00pm until Saturday 6:00pm. I do not believe that it has to be like that exactly, I think you can choose anyday for your sabbath. In Gods Kingdom, it will automatically be the same day for all his people so for me it's not to follow a law but to rest in His arms and trust.