When we sleep people normally advise us to avoid 'North' and 'South' directions. The following are the reasons:
- With head towards 'North' there is a belief that an inclination to the magnetic axis of the Earth may diminish our mental tranquility and productivity levels.
- The South is dedicated towards 'Lord of Death' (Yama) and hence with our head towards South means challenging the longevity of our life.
The most correct and recommended directions of sleep are 'East and West'. Recent spiritual researches conducted by Spiritual Research Foundation are guiding that 'feet' towards 'West' (and hence 'head' towards East) is the most beneficial direction spiritually. Check out more details from here. The positive frequencies with the God help us greatly in this direction.