There is a few schools of thought where most agree that they are different. However the fact is what happens during sleep is that be it an unconscious dream, a lucid dream or an out-of-body experience we are always in the same central location for everything we experience. What makes the experiences different is what we are focusing on in terms of information, but where we reside is in a mind-generated non-physical state.
It took me a very long time to come to realize that all the information represented in sleep related consciousness and the type of content that these experiences provide were all merely the results of simulation. What I mean by that is in a lucid dream, and even an OBE I could remain static and have the setting move around me rather than move through the setting. This was because at the center of the experience was my awareness and the dream content was a simulated rendered product.
So flying, or traveling to some assumed far-distant reality system on some astral plane may have presented the sensations and experiences of moving through space and time but the more I peered into this process it became apparent that I was not moving, I was not traveling, I was only rendering information like a 3D rendering farm in some advanced computer simulation. These experiences started to reveal information nodes where if I focused on a point it would become a tunnel that then turned into some reality that had all the characteristics of our physical world but I would be asleep and lucid in a non-physical state.
From that the bigger realization was information was flowing in datastreams and all I could do was tune in and interface with a stream of data. It's the datastream that we then experience and render.
So what is a lucid dream, a type of datastream. What is an out-of-body experience, another datastream. It's all information that we are both creating and experiencing in a singular non-physical focal state of awareness that likely exists like the singularity within an event horizon. Space/Time are all emerging properties of information from a geometric, mathematical and can easily derive themselves from information processing like we see with computers and the human brain.
Hence time/space may not be what we think, here's an article on it:
Time and Space are not what you think! | A World of Precognitive Dreams - YouAreDreaming.org
What matters is achieving consciousness during sleep... that is the desired outcome as it's going to be a gateway to many new and wonderful experiences. As far as I am concerned dreams, lucid dreams, out-of-body experiences and near-death experiences are just different streams of information that we plug into and render out as an experience. They all take place within our central awareness which is static like a point in I'm very much into singularity consciousness and how it virtualizes time/space using thought to create dreams which simulate reality experiences. If that makes any sense

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