A Sabbath Rest

While my husband rests, I contemplate the meaning of rest as we know it today, versus the "original" rest declared by God
(Genesis 1:1-2:4)

The Bible Sabbath is a weekly day of rest and time of worship. On Wiki it explains it as being "observed differently in Judaism and Christianity and informs a similar occasion in several other faiths. Though many viewpoints and definitions have arisen over the millennia, most originate in the same textual tradition.
Sabbatarians believe that Sabbath-keeping is central to following Christ, and that he highly regarded Sabbath, while non-Sabbatarians believe that Christ has power to abrogate Sabbath, and that he reinterpreted it nonritually." Hmm. Ok so some people observe this day of rest as a God-sanctioned, non-optional day of rest and others see it as a non-legalistic, optional activity.

Can rest be optional? We can't live without resting. We are limited in our ability to feel energized, think clearly and operate effectively when we have even a moderate amount of tiredness. While rest and sleep are not the same thing, they are indisputably related. We need to sleep to survive, and we need to rest to live well. Charl needs rest right now to recover and rebuild depleted strength and energy reserves - the ones healthy people take for granted. For him, rest is certainly not an option. I'm pretty sure this applies to me too.

C.S. Lewis said that "a man can no more diminish God's glory by refusing to worship Him than a lunatic can put out the sun by scribbling the word, 'darkness' on the walls of his cell".  By the same logic, is it not fair to say that we can no more negate the command to rest by refusing to rest, than a child can rouse to life a stuffed toy by longing for it to be alive?