1) I have seen this discussed a few times here on DV.
LaBerge stated in his book that he researched this, and found that dream time is about equal to waking time.
However some people (me included) have had dreams that last longer than the total amount of REM sleep you experience per night.
This could be explained by how our memory works. We don't memorize every single moment of our life.
For example if you take an 8 hour car drive in waking life, you'll only remember specific events (conversation in the car, fuel stop, start and arrival etc), but not so much every moment of driving on a highway.
If you only experience these memorable moments in the dream, and it leaves you with a feeling of exhaustion when you arrive, the experience will be identical to waking life, even though it lasted only a few minutes instead of 8 hours.
This is just a theory though, so take it with a grain of salt.
2) I have never heard of anyone doing it that specifically. It is possible to recall a vague memory though, and try to recreate it in your dreams and trying to live through the events that occurred.
You'll have no way of telling if what you witness is true, or something made up by your subconscious mind though.
I think someone who has studied hypnosis may be able to give you a more specific answer to this though.
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