What features of a planet would cause humans living there to develop vampire like traits?

I'm imagining that a group of humans was transported to a different planet almost 100 thousand years ago.

The planet is similar enough to Earth that they can survive, and already had other earth-based life forms living on it which had arrived there many millions of years ago, but nothing comparable to the level of human intelligence.

Any traits you associate with vampires are cool as long as you can explain them.

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What features of a planet would cause humans living there to develop vampire like traits?

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