Which direction does the sleeping head face? What is the correct way to sleep?

Which direction do I think the sleeping head faces?

1. It is best to sleep with your head facing north and your feet facing south.

2. The human body will be affected by the earth's magnetic field. When sleeping, the human brain will be affected by the magnetic field. You can choose to sleep with your head facing north and your feet facing south.

3. When sleeping, it is best for the human body to sleep on the right side, so that the endurance of sleep to the heart will be reduced when sleeping.