Social life and timing mostly revolves around how early you get up. "Its late" kind of means "I am behind schedule to get enough sleep before waking up".
Biologically, we are programmed around sunlight. Whilst our mornings aren't really controlled by the biological clock (that is what the alarm is for), the evening really are. Besides, the for many people, the evening is what separates 'civil life' from 'private life'.
I too want the same time worldwide but I guess the best we can do is UTC. I mean we could do it but I fear we'd just be sweeping the ugliness under the rug. I don't want this kind mess https://en.wikipedia.org/wiki/Time_in_China
> Currently, timezone usage within Xinjiang is roughly split along the ethnic divide, with most ethnic Han following Beijing time and most ethnic Uyghurs following Ürümqi Time.
No it doesn't.
If you say you got two hours of sleep, that tells me something. When you sleep is your own choice.