"I dare not sleep in the darkness" would also be correct, at least in British English.
Please report alternative translations using the Report an error button, thank you!
I'd love to, but it doesn't let you suggest an alternative/correction (unless I'm just blind).
When your answer is rejected, you get the option My answer should be accepted.
Sometimes it's not among the options, i don't know when or why.
Why Duo? Afraid of "hearing voices"?