Discussion on whether sleeping while sitting invalidates the ablution.

The Shaykh : ... in a state where it is not possible for what invalidates his ablution, such as sound or wind, to come out of him, and reality is the opposite of that. That is, a person who is deeply asleep may have... is that correct or not? So what is the benefit of the narration here? The most correct opinion is that whoever sleeps should perform ablution. Therefore, a leader among the leaders of hadith and jurisprudence returned to this opinion, namely Abu 'Ubaydah al-Qasim ibn Sallam, the famous hadith scholar and linguist, the author of the book "Gharib al-Hadith".
He used to hold the view, like what you read in this title, that sleeping while sitting... does not invalidate the ablution, until one day he was sitting in the Friday mosque listening to the preacher when a man fell asleep next to him. When the preacher finished and the iqamah was called for prayer, he said to him, "Get up and perform ablution, for you have slept." He said, "No, I did not sleep." He said to him, "You slept, and wind also came out of you." He said, "No, it was you who had wind come out of you."
And from that day, he returned to the generality of the hadith because he saw with his own eyes a sleeping man with a support, and he was told he had not slept at first, but he was told, "You slept, and moreover, you also did it." He said, "No, you are the one who did it and you are the one who acted."