On the authority of The Mother of the Believers Aaishah رضي الله عنها she said: “The Prophet  صلى الله عليه وسلم would recline on my lap while I was menstruating then start reading the Qurān.” [Bukhari 297, Muslim 301]

Al-Haafith Ibn Rajab رحمه الله stated: “In this narration is the evidence for reciting the Qurān while reclining, laying down or being one’s side. That enters into the statement of Allah:

” الَّـذِينَ يَـذْكُرُونَ اللَّهَ قِـيَاماً وَقُعُـوداً وَعَـلَى جُنُـوبِهِم”

[آل عمران/١٩١]

“Those who remember Allah while standing, sitting and lying down on their sides.”

[Soorah Aali ‘Imraan:191]

Taken From: Fathul-Baari V. 1 Pg. 406

Translated by Abu Yusuf Khaleefah