Although you may feel bad about having sexualized dreams or being aroused while asleep, it is not necessarily a sin. These things are probably a result of your past choices, whether from viewing pornography, having illicit sex, masturbating, or a combination of all of them.
Then, is Lucid Dreaming dangerous spiritually?
Lucid Dreaming is not really dangerous. Although some people would like you to believe it is, maybe they've had a bad experience, or maybe they weren't even in control of their dreams to begin with. This being said, Lucid Dreaming is not dangerous and Astral Projection shouldn't be considered dangerous either.
Additionally, can a person read text in a dream?
Not really. Simply put, you can't read real-life books in dreams because your eyes are closed. If you are reading in a dream, the text is a projection of your subconscious. It may make sense, at least in the dream, but it doesn't reflect reality.
What are the mortal sins Catholic Church?
Three conditions are necessary for mortal sin to exist: Grave Matter: The act itself is intrinsically evil and immoral. For example, murder, rape, incest, perjury, adultery, and so on are grave matter.
Can lucid dreams kill you?
It's surely possible to die in your sleep or inside of a dream, however, to be killed by a (lucid) dream in the real life – not really. Honestly, there is really no evidence that a lucid dream can kill you. Many people are reporting that they have dreams in which they are dying.