I've been lucid dreaming for more than a year now and it seems there's an even split between people who believe lucid dreaming occurs exclusively in the mind and people who believe we dream in some Astral realm.
I can appreciate Daniel's perspective on this, that while the astral plan is possible, and may 'feel' real, science cannot back it up. However, lucid dreaming has been proven by science.
At the same time, I would hate to repeat the folly of flat earthers of the past or cigarette smokers of the 1930's who had the wrong idea and made lack of science the excuse.
I like the phrase, "best available balance of evidence". While we do not have evidence of an astral realm or that we even go there when we dream, many of those who have a strong opinion (one way or another) tend to have fairly compelling anecdotes to support their view.
IF there are deities out there that are trying to influence us while we dream, and IF some light can be shed on man kind's fate by uncovering mysteries in other dimensions, than we as oneironauts would do well to explore this and see what we find.
This is what I plan to do and would be curious to hear other intelligent (and twaddle free) perspectives on this. :-)