Myth is that it invites ghost or death.
Sleeping with head in North direction brings bad luck.
Never sleep with the head towards the north as a result of the magnetic field of the world lies in an exceedingly north-south direction energy levels will be thrown out of balance by this robust field.
All these are based on rotation and revolution of earth.Human body has its own magnetic field (Also referred to as hearts magnetic field, as a result of the flow of blood) and Earth is a giant magnet.
Once we lie with head towards north, our body’s field of force become totally asymmetrical to the Earth’s field of force.