Scientists say that sleeping on the left side is not favored, as the heart would
be under the pressure of the right lung, the biggest of the two lungs,
and this would affect its contraction especially if the person is old.
Also they assure that the full stomach which itself is under the
pressure of the heaviest organ in the digestive tract, the liver, which
delays its emptying, would also impose a pressure on the heart. Hence
they advise people to sleep on the right side especially for patients by
any heart disease.
Glory to Allah!!! Who told our prophet this medical advice?