Question

Which two sentences correctly use a dash?

Most of the working population today is troubled—by lack of sleep.
You need to sleep 6—8 hours daily to maintain a healthy body.
The secret to improving your productivity is simple—get a good night's rest.
I found something unexpected in my trash can—a litter of raccoons.
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Answer 1

1) You need to sleep 6-8 hours daily to maintain a healthy body
2)I found something unexpected in my trash can—a litter of raccoons.

Answer 2

Sentence two is correct for sure, and I think the last one is correct also, I'm not 100% sure though for the last one.