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Where I am, I'd be asleep 14 hours a day.

I don't think that is sustainable.

For a start I don't actually want to sleep that much. Nor do I think I could.

That works for latitudes near the equator were the day duration is more or less constant. For higher/lower latitudes daylight changes vastly during the year. How do you cope with that?

All the other critters manage just fine. People can too.

Animals do it doesn't sound like a good reason to me. There is plenty of things humans do and animals don't and vice versa and it's perfectly fine.

The other critters, in general, evolved where they are found.

Humans live in all kinds of environments that are far removed from the East African Rift.

Lots of animals manage by either migrating to the tropics or hibernating through the winter. Neither is viable for a modern human society.

Where I live there are places where the sun doesn't go down for months in the summer and doesn't come up for months in the winter.