Rest day was implemented after God’s creation was complete. We should honor this day and rest. We all need it. Life has become so busy we forget to take the time rest and reflect on all that God has done for us.
And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made. Genesis 2:2-3