I would probably dismiss it all as a dream state too, if not for the experiences I had - including really impossible stuff, like seeing future events.

You can certainly have conversations with other beings there, although I don't think there's a good way to discern the nature of those beings. They are intelligent anyway.

Some people view sexual energy as a fundamental power that can be used for a variety of spiritual purposes, so they suggest that it be sublimated or transmuted.

Maybe these things seem weird - and they are weird - but neither proves that the world experienced while "out of body" is fabricated by the brain, assuming that's what you meant by dream-type state of course.