 Originally Posted by Goldenspark
Hey Sageous, it's the dream cycle that is typically 90 minutes long, not the REM period. That tends to last only a few minutes at the beginning of the night, and maybe 20 minutes at the end. The Laberge eye movement experiment that proved LDs were real tends to suggest that dreams can be in real time (eye movements done by the subject presumably in what he thought was normal time, and recorded on the EEG at normal speed).
Hey Goldenspark, six of one, half dozen of the other, I think. If this dream cycle you mention lasts 90 minutes, and you dream during REM, I figure it must be okay to say that LD's can last as long as 90 minutes, being that that's how long this dream cycle lasts... or is there a part of this dream cycle where no dreaming occurs?
Funny thing though: I've been at this for a very long time, and I had never realized there was a thing called a "dream cycle." I had always thought the sleep cycle, or one full night's sleep, was made up of five stages of brain activity, with REM periods occuring at different times throughout the night (during what would be stage 5) after an initial NREM period of about 90 minutes as a sleeping body moves from stages 1 to 5 -- and then brief NREM periods would occur between each REM period, with those NREM periods becoming more brief as the hours pass (as the REM periods become longer and more closely spaced).
So, as far as I knew, REM periods by no means occur only during the first few minutes of sleep and maybe 20 minutes at the end. But I guess I -- and many, many others, apparently -- could have gotten it all wrong?
Also, I'm pretty sure that LaBerge's eye-movement experiment was about comparing perceived dream time to actual time, and really had nothing to do with how long a LD -- the dream itself, time dilation aside -- can last, which I assume is the subject of this thread.
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