I don't know that I agree that dreaming is dangerous. If we're talking about the kind of dreaming we do while we're asleep, it's actually a healthy and natural occurrence. I have heard that if you die in a dream, you will die for real, but that also seems to be debunked, thus alleviating that danger.

I do believe that it is possible to receive a vision via a dream, and depending on the context, it might be really positive, or not so great. Depending on the outcome, I guess dreaming could be dangerous.

As far as other dreaming goes, such as dreaming about having a nice home, a nice car, a wonderful spouse, an awesome family, a great job, etc., I don't see the danger in doing that either, other than what a person might do to obtain those dreams if taken to the extreme.

Some dreams just can't be fulfilled because the circumstances don't exist to obtain them. In other cases, it might take robbing banks, or some other form of illicit moneymaking schemes, which might make the perpetrator dangerous, or put them in the dangerous situations.

There will be certain situations, such as familial, national, or affiliations, where dreaming of a different life is dangerous, but by and large, we are free to desire something different, more, or whatever.

I would hope that such dreaming would not be dangerous, but a means by which someone can receive the motivation necessary to improve their circumstances and live better.