Dear Gurudev, please tell us which is the best place to put our heads when we sleep (North, South, East or West).
Put your head on the pillow! (laughter)
North has a magnetic pole, so if you put your head in the north and sleep north-south then the magnetic current that flows from north to south passes through your head to your toes. It can be tiring and drain the energy a little bit. This is an ancient thought.
You always sleep east-west so that you cut the magnetic field and let it pass through your whole body horizontally and not through the nervous system. That is a very minor issue, nothing major. It has only to do with the magnetic current.