Personally I always don't feel great in the mornings, I usually need a few hours to fully wake up and function and I don't like going to bed early, why should I? Those hours are my quiet hours and are the hours that I like.

I get it though, it's what works for you. So you should do that, but it's not universal advice, people that find it works just think others should go to bed earlier and follow what they do and poof! like magic everything is amazing

Some people find early hours to be very productive, some people find noon hours to be really productive, and finally some people find evening hours to be really productive. What works for you won't necessarily work for everyone else and pretending otherwise is harmful to all who don't fit your life/body/etc.

Whether that works for you really depends on biological mechanisms you can't change. For some people getting up early works great, however others simply don't fall asleep as early. That getting up early is best is a myth made up by some Prussians who probably belonged to the first category.

night hours are very quiet too. what is your point?