Just because the limit of science is the material doesn't mean that non-material doesn't exist. As for claiming it does exists without evidence, I also think that what people are calling 'non-material' IS actually material. Our tools are not sensitive enough.

@Mindgames: You say that believing that the government wants to suppress us is ridiculous, why is it a ridiculous idea to entertain? You never gave a point, just calling it names. Also, claiming that entheogens are not illegal because of how they give you another valid perspective on experience, but you say that they are dangerous or do not contribute to society. That is because enlightenment is bad for business. Enlightenment historically has always been the first thing and the most consistent thing to be outlawed, even carrying a higher penalty than rape and murder.
Lucid dreaming/astral projection was illegal in Europe during the dark ages since anyone who practiced it were persecuted as witches or Satanists. Witches were burned for claiming that they meet up in OOBEs. Look up the Gnostics.

The first thing that was outlawed when the Spaniards arrived in Mexico was the mushrooms and the peyote that were used in shamanic travels. LSD was legal until the government was done researching it as a chemical weapon or truth serum. They didn't care about its therapeutic uses, so they outlawed it. Now the Chinese just outlawed reincarnation without permission. You have to get a permit in order to reincarnate legally in China now. This is obviously aimed at the Dalia Lama. Isn't alcohol more dangerous to society than mushrooms or pot? But alcohol has no enlightenment side-effect.

If people want to call it a lucid dream or a astral projection it is just semantics. Lucid dream is just the modern politically-correct scientifically sanctioned term. Tomato Tomawto. But enlightenment is beyond semantics.