There is a specific Tantra, mentioned in the Indian spiritual texts which advises on the direction in which a person should sleep, the positives and negatives of sleeping in various directions; the benefits and drawbacks. I will simplify and highlight the main 5 points to be noted for the followers of Hindu Tantra Vidya.
1] While sleeping the head should always face the East or the South direction.
2] If the head faces the North or the West direction, then there are chances that the person will attract illness and disease. This position is not considered good for health.
3] There is a rise in knowledge and intelligence if one sleeps with the head facing the East; recommended for seekers of knowledge.
4] There is an increase in wealth and the number of years one lives, if the head faces the South during sleep.
5] Students are always advised to sleep with their head facing the East; the other members of the house can sleep facing the South.