Personally I prefer keeping a middle road in my practices, so I didn't deeply study the possible dangers of extreme forms of meditation and/or chi gong. But as more and more Bums report about what went wrong in their own practice I think it is time to research meditation sickness and related deviations. So this topic is devoted to the study of meditation sickness and related deviations. Bums are invited to provide information and links to further sources about what happens in meditation sickness and related deviations, and what can be done about it. Please don't (mis)use this topic for promoting personal pet theories, you can open other topics about those if you like. Here I prefer well reasoned and researched comments. I haven't placed this in my personal practice topic because I also want non-members to be able to profit from this topic.