By use of meditation and yoga I've found the opposite to be true. The system I've used is described somewhat here http://isha.sadhguru.org/blog/lifestyle/health-fitness/10-he...
Edit: downvotes why?
Edit: downvotes why?
Blood is not affected by magnetic fields, it seems to me. https://www.quora.com/Why-isnt-blood-attracted-to-a-magnet-s...
The argument in #9 as I understand it is, over the course of your lifetime, the cumulative minuscule effect of how you sleep relative to the Earths magnetic field can have a negative effect on your health, increasing the risk of stroke or brain related conditions.
To prove or disprove would require long term study (in the order of a human lifetime) with equipment capable of detecting very small changes while eliminating all other effects.
Meanwhile the guru in question is one that gets invited to Talk at Google, if that's any measure of credibility - https://www.youtube.com/watch?v=QQn8X4FbpTM