I think I might have been a little unclear:
 Originally Posted by Hypnopotamus
But is REM a necessary stage of LDreaming or normal dreaming?
Of course it is. But I hope you'll bear with me for a moment because I feel that I should point out an odd twist in the popular view of sleep and dreams: REM does not cause dreaming; dreaming causes REM.
REM is literally a symptom of dreaming: that rapid eye movement is not occurring on its own, but because your eyes are tracking the action in a dream. It follows then that you are in REM whenever you are dreaming, or rather whenever you are dreaming you are in REM. So yes, REM is a necessary stage for dreaming, but it's more the case that dreaming is the necessary stage for REM. I'm sure you already know this, as well as the things that follow, but, given the new popularity of REM and the accepted need to "catch" it so you can dream, I felt it worth mentioning.
I could be wrong on this, but another myth that has become reality to many dreamers is that REM periods must occur in the exact intervals that all those charts and graphs dictate. Those charts are averages, not a rule, and keep in mind that they are based on a surprisingly small amount of research, and on lab work that might have an effect on the results: for instance, the sort of subject that can actually get to sleep "normally" in a lab environment with a bunch of wires taped to their skin (or, more impressively, with an fMRI machine grinding away around them) is probably going to be a fairly unique type of sleeper, but that type has become the norm, because subjects who might be light sleepers, or who have a real problem sleeping normally in strange places, are likely never studied. So the norm for sleep cycles, including the frequency and length of REM periods, may not be quite so "norm" as we imagined.
On top of all that, I have found in my journeys that, since REM occurs whenever you are dreaming, you can pretty much enter a REM period whenever you wish to, especially late in the sleep cycle (conjuring dreams during stage 1 or 2 delta/NREM is not impossible, but problematic at best). In other words, yes, if you are taking a WILD dive right after waking from a REM period, there is no reason to assume that you will not be able to enter into a new dream right away. At worst you might have a few minutes of NREM while your dreaming mind spools up another dream, but there is no need to wait another, say, 90 minutes for a new REM period to show up on the sleep cycle schedule... unless of course you've convinced yourself that you must wait for it.
As a sort of aside, I've come to believe that false awakenings are representative of LD'er's ability to enter REM without needing to wait for the next scheduled period. The reason, I think, that FA's content is so simple (usually "waking up" in your own bed) is because, thanks to your lucid input into things, your dreaming mind was obliged to continue processing dreams, though it was not prepared to do so, so it simply grabbed the most readily available memory for its imagery, which is where you were when you fell asleep (or perhaps where you expect to be when you wake up). So the rule for me regarding FA's is this: should one occur, just lie still and wait a moment for your dreaming mind to refire the machinery and start supplying more interesting imagery, as opposed to trying to do something, which usually taxes your dreaming mind to the point where the FA becomes more stable (no new imagery available) or you wake up (your dreaming mind throws in the towel, and your brain's wake-up systems come into play).
Yesterday I re-entered the same dream 3 times but I forgot to engage my senses in the dream and it was just a normal dream (the same dream though). What I've found out is that the 2nd time when I woke up from the dream it was 8.30am; and I re entered the dream. Then when I woke up it was 10.00am. So does that mean you can incube a re entry just when you wake up but the dream itself actually happens in REM stages (around 90 min later)?
Sure. If a dream has gotten a good foothold in your mind, there is no reason you can't go back to it, either immediately with a DEILD, or with your next round of dreaming if you're not lucid... and, of course, that next round is not required to be 90 minutes away, especially if you are a few hours into your night's sleep.
Is this what you mean with ?
No, I meant that if you desire dreams to occur a bit ahead of schedule (as with a DEILD), they will likely occur... oh, and one reason DEILD's work best if you try to reenter the dream you just exited is because the imagery already exists, so your dreaming mind has an easier time producing so "off-schedule" dream.
But yes, and again, you can certainly incubate a dream now for your next REM period, whenever it occurs.
Besides, I have the same experience with hypnagogia: I have hynagogia (with auditory and visual hallucination) just after I go to bed (so not even in REM stage).
Except that I'm pretty sure that HI and REM are unrelated.
I'm not too obsessed with REM stages but I'm trying to figure out if your mind can actually prepare the dream ahead of schedule. That would terrific.
Yes it can, and it is.
tl;dr: Yes, REM is a component of both lucid and normal dreaming, but REM occurs when you are dreaming, and not the other way around. So if you happen to be dreaming "off-schedule," you will also happen to be in REM off-schedule... and with lucidity, "off-schedule" REM is not only attainable, but probably pretty common (i.e., FA's). And, of course, if you expect that you will have to wait 90 minutes for your next REM period, you very likely will; try not to take all those charts too seriously.
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