But I really can only blame myself for this.
Was easy too, 'can we meet at 4:30' 'Hmm, I come in pretty early, and like to get out the door by 3:30, can we do it earlier?' was a typical exchange.
Also, depending on your office arrangement your team-mates just know you get in early when they always see you in the office when they get in. But, ymmv, I am sure it varies from workplace to workplace.
I used to do the stay up late thing, and while work did get done, it's nowhere close to what I get done in the morning.
The challenge was that there are very rarely obligatory early morning events. There are often late day events and issues.
If I wake up early, I can't stay until 9PM without being miserable. But something requiring me until 9PM is far more likely than something at even 8AM.
Now, I consider 5-6AM early and that's when I typically wake up - haven't used an alarm in years.
Also, if your waking hours are say 0800-2300 then you can easily work late and move your leisure time to the morning without changing your sleep schedule.
Not necessarily. Early birds like me find it difficult to work in the evenings, despite being technically awake. I find it way easier to get up early than to stay up late, which can actually feel like torture sometimes.
As for the split, I've read it's more like 10% for each extreme with the majority in the middle, though I can't find a reference, and I suspect it's very hard to actually know.