Except the 24 hour clock is already internal and sleep affects everything in your life. Not getting adequate sleep is detrimental to your mental and physical health.
Humans live all over the planet.
Some places have very different light/dark cycles than others.
Even if you never move geographically depending on Earth's position within the solar cycle you will experience varying amounts of light/dark over the course of time.
But you're advocating for everyone locking themselves into a perpetual unbending 24-hour cycle?
1) That's not natural and never would have been common except for the industrialization of societies with the subsequent implementation of regimented "shift" work to maximize productivity (profits).
2) Why do you presume a natural sleep rhythm (and some of us require far less than 8 hours) is "inadequate"? Because it wouldn't work *for you*? We are not all the same. We are not manufactured from standardized parts and assembled in exactly the same way every time. We are not machines.
The alternative, which would include a life of leisure devoid of an alarm clock, is a perpetual jet lag state since we shouldn’t get more than 8 hours of sleep each night.
Who said anything about leisure? Why would you presume someone who doesn't use an alarm clock must be lazy and unbalanced and prone to sleeping all the time? Is that how *you* would be if you stopped using an alarm?
It's like you refuse to have any curiosity or imagination that might contradict your complete and total belief in the sanctity of the work/play/sleep paradigm designed to create productive drones in service to the hive of capital, not genuine and whole individuals who are existing entirely as themselves.
That's kind of an impasse and I think I'm done here.
It's been interesting though, thanks.