Yup. Only works if you can hit your nap times every time without fail. A single missed nap will completely ruin everything. Not a lot of people have lives/jobs conducive to naps every 4 hours on the dot.
What it is, is an extremely powerful tool for reducing uncertainty about the world. Not eliminate, reduce. What it is not is a tool for “proving” “facts”. Claiming a “proven fact” is belief, not empirical science. An extremely consistent and useful theory, of course! But not a proven fact.
I predict that once robotics and AI advanced beyond some particular threshold, human-on-human relationships will be seen as strange and needlessly fetishistic. Who would want some grimey partner with their own needs when you can generate an infinitely moldable soulmate?
On a serious note, yes Christmas was placed where it was in order to coincide with Saturnalia, the Roman winter solstice festival. This was an attempt by Constantine, the emperor who legalized Christianity in Rome, to transition the Romans to Christianity more easily.