Sleeping with feet facing south - A Spiritual Perspective

The South direction is associated with the region of Death (Yamaloka),
the subtle basic raja-tama frequencies and distress. When we sleep
with our feet facing the South direction the vibrations from the
Yamaloka (region of Death) and Paataal (region of Hell) join together.

Due to this we attract the subtle basic raja-tama frequencies or
ghosts. Due to the combined effect of the above when we sleep with our
feet facing the South, we can suffer distress in the form of
difficulty in falling asleep, nightmares, feeling scared in sleep or
waking up in fear.

More at :
http://www.spiritualresearchfoundation.org/spiritualresearch/spiritualscience/how_to_sleep_well/sleepingfacingsouth.php