For having lived in both continents, American is generally an early morning culture and Europe is generally an evening culture. There are local differences within the continents of course.
I wouldn't generalize Europe like that, our differences in the normal schedule are massive from north to south.
Here in Sweden, it's a morning culture. Blue collar workers often start work at 7, daycare is open from 6 in the morning for parents with early jobs, dinner is at 18 or even 17 for people. At 22, most places are closed including supermarkets and restaurant kitchens. Lunch for the vast majority of working people is at noon.
That is totally different to a country like Spain, where you see families - with kids! - start dinner at 21 or later. In Sweden people would say it's strange not to have your kids in bed by then. Lunch is at 14, cities are full of life until midnight every day.
A large part of that is probably due to daylight hours. A big chunk of Sweden is dark by 16 for the winter half of the year. During November-January there's minimal light and it's gone by 15.
Don't know about the US, but isn't it "9to5" there too? Is there much "culture" before 9?
I can say in Germany "9to..." is also applying to cafes, supermarkets, ... pretty much nothing is open before 8 in the morning (with the exception of stuff in train stations), even some supermarkets only open at 9. So there certainly is no "culture" earlier than that. School often starts at 8, so parents frequently start the day at 6 or earlier. Same if you got an hour commuting time etc.. I don't know anybody who would wake up at 4 by choice, tho.
