Early Bird vs. Night Owls

I recently had a discussion with a co-worker who is amendment that she is more productive programming planning at night. I used to be the same, but I have switched to an early morning start instead and found that the quality of my work increased drastically. I guess it depends on the person- but I wonder if anyone would have had similar experiences?

Some of my most productive times were in school when I got up super-early, went to classes before noon, slept all afternoon, and then studied til late at night. Early morning and late night are both really creative times, while afternoon is pretty much a waste.

Title: "Early bird programming vs. night owl hacking – which is more productive?"

but it mentions nothing about productivity in the article.