So I came across some ancient teachings suggesting that facing north is not good, because of the north pole magnetism. According to them, sleeping daily facing with the head to the north, leads to increased blood flow to the brain, which can cause sleep disturbances, nightmares and if accumulated for years and decades may even lead to hemorrhages and strokes.
I was curious, if there were studies, which explored this topic. I haven’t found studies to this particular topic, but, interestingly, stumbled upon this little abstract, that is even more fascinating. Just wanted to share that with everybody here.
So apparently, sleeping in an east-west position instead of a north-south position leads to a REM latency. Which basically means, that the period between falling asleep and the onset of the first REM period is shortened.