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SCIENCE:

According to Science, when a person sleeps on the left side, the heart is put under pressure by the right lung, which is larger than the left lung and this affects its function and reduces its activity. Experiments have proved that passage of food from the stomach to the intestines takes longer when slept on the left side by 2.5-3.5 hours.  

ISLAM:

The Prophet Muhammad ﷺ used to sleep on his right side and encouraged his Ummah to sleep on their right or back.

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It was narrated from Al-Bara' Ibn 'Azib, may Allah be pleased with him, that the Messenger of Allah ﷺ, said: "When you go to bed, do Wudoo as for prayer, then lie down on your right side, (...)" [Narrated by Al-Bukhari, Muslim]

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