Here are some (strawman?) arguments that support your view, but are they actually justified/true/not-true-for-staying-up-instead?
- it takes effort to build a habit of waking up early, therefore it's good
- the hardest workers i know wake up early, it must be integral to why they're productive
- college kids stay up late, and college kids lack discipline
- being out when the sun is up is healthy for you, so sleeping through sunlight is bad for you
I feel like if businesses operated from 12pm-12am instead of 9am-9pm, all these would be flipped in favor of staying up late =/
For one, just like you can't get up early, some of us can't sleep in. Takes no effort for me to build up a habit of waking up early, my body just likes to wake up at 4:30AM. I go to bed relatively early because I'm going to be awake at 4:30AM either way so I might as well try to make a full night of sleep happen.
Other than that, I think there might be a bit of moral judgement going on, but I think it's just that the business day starts at 8:00AM and sleeping past that looks like lazy or luxury. One thing I like about working in tech is that there is less judgement there -- hell, if anything, I get more flack for waking up at the crack of dawn than my coworkers who get into the office at 10:30AM or 11:00. I'm not the only guy who gets into the office early but on my team I'm in the minority.