Try running global Internet services offered in multiple languages. With the right kind of monitoring, you can see individual countries waking up and going to sleep, without any geolocation, just by watching changes in language mix.
Still up? Yeah I kinda like when I pop off 10 comments and get nothing, go to bed, and then wake up and they have a bunch of upvotes and replies. It's a nice little surprise but it does make it hard to hold a conversation sometimes
American here. When I start seeing European posts in my All feed I know I've stayed up too late and need to go to bed. It's fun to see them, too. Sometimes I almost think I can understand the Dutch headlines.
I've heard that the Dutch are really Germans who suffered head injuries. Since they cannot drive safely in their condition, they were sent to the Netherlands to recover where they can get around on foot or on bicycle.
I'd throw you way off. I'm in the U.S. but I'm usually awake by 4 am (thanks, dogs), my lunch is at 10:45 and I'm usually in bed by 8 due to the aforementioned dogs waking me up at 4.
Work starts at 7. At this point, I sort of enjoy having 3 hours of quiet before work. I have a relaxing cup of tea, I exercise, I hang out with the mutts, etc. It does suck that I have to be in bed so early, but it sucks more for my wife because I can't be out late anywhere at this point. If I try really hard, I can stay up until 10. It took excess caffeine to get me to stay up until midnight on NYE (I can't remember why I had to now).
And what sucks is that if I do stay up late, I can't sleep in the next day because the dogs wake me up! I wish I was the sort of person that can just go back to sleep once they've been woken up, but when I'm awake, I'm awake.