[AnimalMuppet]

Biologically, don't most people wake up at dawn? That doesn't get you to the office at 7:30 AM in the winter.

That is, our schedule is not a biologically-based schedule. "Morning" (as defined by our society) is not the biological default.

[EpicEng]

Sure, but you're quibbling over an hour here or there. When people use the term "night person" they don't mean someone who wakes up at e.g. 8 instead of 7, we're talking about pushing back work by many hours, which just isn't possible for most people without a much shorter work day (I'm ok with that!)