Can you please explain how you draw the conclusion that you "have" to give them rest?
Remember, all we're doing is mimicking Mother Nature.
Not reinventing; we're aping, with maybe a little respectful tweaking.
Lights trying to mimick, replicate and improve the Holy Grail spectrum in a quest for the Uber Daylight.
Schedules to optimise plant output.
The ruderalis component of the Auto can thrive in northern tundra regions with 20+ hours of light.
But for anyone who lives in the northern north, or even experienced the white nights of St Petersburg can attest, even at its peak the night lights are not full daylight.
We don't find full daylight 24/0.
It is an "unnatural" schedule.
Extreme - intentionally - to push the genetics to the limits, and often beyond.
It is essentially having a naughty threesome behind the gardener's shed with the law of diminishing returns, and risk/reward.
That doesn't mean it's bad.
Rules - even nature's - are made to be tested and broken.
It's simply not mimicking nature and would require some form of evolutionary/natural selection type of epoch leap ... which to be perfectly honest, i can't be assed engineering, nor waiting for.
Push them beyond the limits, the law of diminishing returns pulls a muscle in the midst of some karma sutra expert contortion, and excuses herself from the threesome, with you left staring at risk/reward anxiously, wondering if you should continue in her absence, or is it etiquette to back off until she comes back. Stress does that. It's all fun and games until stress joins the party and goes in for a sneaky touch and fondle, and breaks the rhythm and mood of the tent lovefest. we're all just one over enthusiastic thrust away from a ruptured frenulum, and an rushed and bloody trip to the Emergency ward.
So to optimise the karma sutra pleasure, even Rasputin needs a little rest time now and then.