My opinion (as a qualified psychologist :] ) - a bunch of b***it

Show me the data, show me statistics, reports, research - then we can discuss
Sorry, but Wikibooks (especially without direct references to solid literature) is not a reliable source of information.

If you have no mental disorder, everything is fine. If you do however, then i guess, you are not able to achieve lucid dreaming.
Agreed...
Unless you're mentally ill,there's no risk...
if there were,I think we'd hear about it...

The following possibilities are controversial and have not been proven.
All I need to know...