Sayyiduna Jabir (may Allah be pleased with him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "No person should lie on his back in such a way that one of his feet is placed over the other."

(Imam Ibn Hibban, may Allah have mercy on him, says:) The act which the Prophet Muhammad (peace and blessings be upon him) forbade refers to a person lying on his back in such a way that one foot is placed over the other. The reason for this is that people used to wear waistcloths, and if someone who is wearing a waistcloth and not trousers lies in this manner, it may result in his private parts being exposed. For this reason, the Prophet Muhammad (peace and blessings be upon him) forbade this.