The Messenger of Allah(ﷺ) forbade that a man should lie placing(and according to Qutaibah’s version: “should raise”) one of his legs over the other. Qutaibah’s version adds: When he was lying on his back.
Sunan Abi Dawud Book 43, Hadith 93
← Previous Hadith I saw the Messenger of Allah(ﷺ). I asked: How did you see him? He said: He was white, good-looking, and when he walked, it looked as if he was descending to a low ground.

Sunan Abi Dawud Book 43, Hadith 92 Next Hadith → ‘Abbad b. Tamim quoted his paternal uncle as saying that he had seen the Messenger of Allah(ﷺ) lying on his back in the mosque according to Qa’nabi’s version) placing one foot over the other.

Sunan Abi Dawud Book 43, Hadith 94