You feel pain in you dreams as pain is in the mind via nerve impulses telling you something is "damaging" you.
The general way of waking up is "death"- well near death as in you wake up when u get shot, etc.
The commin dream people have of "falling" and waking up with a jolt - the rumour that "you die irl if you don't wake up" is true. But not for "dying" in the dream. That jolt you recieve is because your heart either stopped or you stopped breathing for a split second and your bodies natural instinct jolts itself to either wake you up to start breathing again or to automatically regain rhythmn.
With lucid dreaming REM sleep you use like 80+%
of brain. And people such as picaso asked a question in this sleep state to show him
a new style of art. Da vinci has been reported to doscovered things that "came to him
in a dream".
This is due to the massive functioning of tbe brain, though no one knows why.
REM= rapid eye movement. It was initially suggested it was you focusing on things in your dream but later proved it wasn't with a series of tests. Tho REM has been linked to development and restoration and some psychologists believe the higher functioning is to repair the brain and body swiftly with the limited time
we sleep for.
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Tho when we learn to lucidly dream we can harness its potential!!