وعن يعيش بن طخفة الغفارى رضى الله عنه
قال: قال أبى: بينما أنا مضطجع في المسجد على بطني إذا رجل يحركني برجله فقال: «إن هذه ضجعة يبغضها الله«قال: فنظرت، فإذا رسول الله صلى الله عليه وسلم»
My father said: I was lying down on my belly in the mosque when someone shook me with his foot and said, “Lying down this way is disapproved by Allah.” I looked up and saw that it was Messenger of Allah (sallallahu alayhi wa sallam).
Riyad as-Salihin 817, Book 5, The Book of the Etiquette of Sleeping, Lying and Sitting etc, Hadith 5. 1 min read