We should not to sleep with our head towards north direction. The myth behind this is that invites ghost or death, but scientific reason is because the human body has its own magnetic field (also known as a Hearts magnetic field, because the flow of blood) and the earth is a gigantic magnet. When we sleep with head towards north direction, our body’s magnetic field become completely asymmetrical to the earth’s magnetic field. This creates problems related to blood pressure and our heart need to work harder to overcome this asymmetry of magnetic fields.
Moreover of this our body have significant amount of iron in our blood and when we sleep in this position, the iron from the whole body starts to congregate in the brain. This can cause headache, Alzheimer’s Disease, Cognitive Decline, Parkinson disease and brain degeneration.