Some reasons why Muhammad SAW slept on his right side: Sleeping on the right side does not let the weight of stomach & intestine to suppress heart, hence blood circulation is not affected. By sleeping on the right side, the heart remains in the topside, one will not have a deep sleep. A little noise can prepare some one to face any contingency. It also develops the habit of early morning rise. Imam shafi states that there are 4 types of sleeps: to lie on the back-this is the sleep of the prophets. To sleep on the right side-this is the sleep of the worshippers (us!). To sleep on the left side-this is the sleep of the ruler. To sleep on the stomach-this is the sleep of the devil. [related by Al-BUKARI, Muslim, Al-TRIMIDDI AND ABU-DAWOOD.] [SHARE]