Recently I posted a reply on another thread referring to the really horrible effects of kundalini, which are apparently largely ignored or overlooked in the subject.
See:
http://www.yogaforums.com/forums/showpost.php?p=67493&postcount=2
People jump into Yoga/TM without knowing what they actually do and what physical and mental effects they may have to face in the long run. Apparently Yoga can open you up to the spiritual world, (looks like such world does exist, after all!), which however seems to be not exactly the place where one would want to be. While we are alive, why would we want to dwell among the dead?
Today I found another source that may be interesting to some, because it talks about the possibility of recovering from the horrible effects of Yoga/TM:
Source: http://www.yogadangers.com/AbouttheAuthor.htm
There are some other testimonies at:
http://www.yogadangers.com/ChristianityandKundalini.htm
In any case I would really recommend to you all to do a profound research on Yoga/TM before jumping into any form of it, or before deciding to go on practising it.
Looks like its heavenly promise with time shows its real face and turns into the opposite.