Think of this way, it’s healthier to rise with the sun.
Lots of places don't have sun at all, or have little sun in the winter. People cannot get up with the sun. Again, the earth is constantly changing what that means, and also varies alot based on where you live.
Like it or not we’ve arranged our society to start at 8 am
No. No we haven't. People do things at all hours. Also, see the point above.
And you do understand our circadian rythyms are connected to the sun right? The sun dictates our rhythms, not the other way around.
Ok, so get up when that happens if you want. It has NOTHING to do with the arbitrary time we assign to a clock. The day does NOT care what number we assign to it.