If you adhere to vitalism, however, you might argue that dreams are evidence of a plane of existence beyond matter which consciousness will inhabit in the afterlife. Indeed, believers of this notion often interpret WILDs (particularly those where the getting out-of-body method is involved) as astral projection.
The notion of visiting astral planes during dream consciousness holds no water, though. The simple fact that anything can happen in a lucid dream can rule out the validity in the notion that what is experienced during lucid sleep is real. It may feel real (if we take real to mean objectively existing) in every way, but the dream world's emulation of the real world is no proof when we consider that the brain is quite capable of creating reality models.
Theories on the nature of dreams aside, they can still be useful and insightful. When it comes to lucid dreaming, rather than rattling your brain over whether or not you travel to another plane of existence, why not focus on its practical ends...
Lucid dreamers can use the heightened placebo effect in dreamland to assist and speed up healing; facing fears is a psychological boon that helps with self-integration and therapy; contacting deceased loved ones can help with grieving regardless of whether you think they are real or simulated; in the dream world you can eat as much as you want and use this as a psychological advantage to help with dieting; one can learn new skills and hone existent ones which can help with confidence and adroitness; access the subconscious mind reservoir for information and problem-solving; visit exotic places and other worlds and have adventures for escapism and entertainment; you can ask the lucid dream world to generate new ideas at your request for artistic purposes or creativity in general etc etc.
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