8 hours of continuous REM sleep? As far as we know from scientific data, no, this is not possible.
Essentially, your sleep cycle is categorized in non-rapid eye movement sleep and rapid eye movement sleep. Non-rapid eye movement sleep is subdivided into 3 stages.
Stage 1 is transition between drowsiness and light sleep, where stage 2 is actual sleep. Stage 3 is deep sleep (also called delta sleep).
Two important aspects of REM sleep is that your REM periods will increase in duration as the night progresses, and the interval between your REM periods will decrease; thus you will experience increasingly longer REM periods over shorter intervals of time. In average you will have around 5 REM periods during your sleep, and the longest ones will have a duration of around 40 to 60 minutes. So not even close to that of 8 hours.
Usually a sleeping cycle progress from stage 1 to stage 3, then it goes back to stage to. After around 70-90 minutes of going to sleep, you will experience your first REM period, which in the beginning will be short, roughly around 10 minutes. After it ends, you might slip back up into stage 2 of non-rapid eye movement sleep, go back into delta, then come back up for your next REM period, and so on throughout the night.
Yeah I know there's a wiki but I've understood everything except that REM thing which seems to be a gap that has to be filled in order for me to be able to understand some other things.. And I can't find what REM sleep is anywhere (or maybe I have seen it before and I missed it lol)..
There is not much you need to know about REM sleep of technical terms to understand the basic outline of it (I surely don't ). REM sleep is simply a dream stage which is characterized by your eyes moving very rapidly. Another thing is that most dreams, and most vivid dreams people report, have taken place in REM sleep, that is to say, REM sleep is more or less the stage in which we dream.
Another thing about REM sleep is that your body gets paralyzed in order to prevent you from acting out your dreams. Sometimes sleep paralysis doesn't turn off right when you awake, and this is where you can get those scary experiences of being unable to move while seeing or hearing odd things around you.
If you have a pet you can actually also observe REM sleep. When my dog sleeps in my room at night, there will be times where I can see him twitching a lot, small movements of his legs and so on. His eyes will also be moving around a lot. Additionally you can also hear him barking a bit and so forth. Actually he's doing it as I write this 
You can read more about it here:
Rapid eye movement sleep - Wikipedia, the free encyclopedia
Since WILD basically takes a person from a waking state to a state of dreaming, is it possible to spend the entire time sleeping on a lucid dream?
Well you have to remember that when you WILD, you are simply aware of the entire process from going to sleep to entering a dream. If you had not WILD'ED while going to sleep, you would have fallen into sleep in exactly the same manner, no difference there. Only difference is that you made yourself aware of the process. When the REM period which you entered (through WILD or not) ends, your dream, like others already mentioned, will simply stop.
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