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Can I use a negative statement with "until". For example: 1. Until you don't sleep, you wouldn't get energy.
2. Until you listen to your heart, success will never be yours.
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Yes.

You won't have much energy until after you get some sleep.
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Thanks for your reply. Is my second sentence right? "Until you listen to your heart, success will never be yours."
and can I also say "until I don't sleep how can I get energy?" I am asking all this because someone told me it's not a right sentence.
Thanks.
"Until you listen to your heart, success will never be yours."

It is fine.

Until I don't sleep how can I get energy? This one is not right because it does not make sense.
Maybe you mean:
If I don't get any sleep, I won't have any energy.

There must be an event, describing a point in time to follow the preposition "until"

Example: She won't wake up until (when, what time, something happens)?

when can be:
6 o'clock -- She won't wake up until 6 o'clock.
the sun rises -- She won't wake up until the sun rises.
her baby wakes up -- She won't wake up until her baby wakes up.
someone kisses her -- She won't wake up until someone kisses her.

A negative clause does not describe a particular event that marks a point in time:
example:
he never comes home. - There is no point in time here. Nothing happens.
I don't sleep -- There is no point in time here.

So the main clause can be positive or negative, but the clause after "until" must be positive.

Success will never be yours (negative statement) until you listen to your heart (positive statement)
Thanks a lot... I got my answer...Emotion: smile
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