Guides
One guide per real question. Each one answers in the first 60 words, says when it was checked, and links its sources.
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How to make a Mac screen darker than the minimum brightness
The brightness keys stop at the panel's lowest step. Reduce white point in macOS, Atapa's dim slider and brightness keys, a Shortcut, and the limits.
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Night Shift not warm enough? What to do, step by step
Push Night Shift to More Warm first; it stops around 2700 to 3000K. For a warmer or deep-red screen, including on M5 Pro, here is what works.
Updated