Riyad as-Salihin

Ya'ish bin Tikhfah Al-Ghifari (May Allah be pleased with him) reported: 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 (ﷺ).

[Abu Dawud].