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Hello, teachers!
Are both natural and common?

1. Don't wake her up. Let her sleep more.
2. Don't wake her up. Leave her to sleep more.

Thank you very much.
Peace!
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They both sound fine.

You might want to consider 'for longer' instead of 'more'.
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the right sentence would be
Don't wake her.Let her sleep some more.
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Thank you very much.
Enjoy the gorgeous fall sunshine!
 anita_a's reply was promoted to an answer.
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It could be a British vs. American English difference. As an American, I would say let her sleep some more or let her sleep longer (not for longer), or just let her sleep.
I was thinking the same thing. I assumed "for longer" was a British way of saying it, because in the U.S., at least, we just say "sleep longer". Maybe Nona will give us a clue about this one.Emotion: smile