[harryf]

I can't attest for that point scientifically or even personally.

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.