Everyone yawning is biddah!!! haha jk. Seriously we should abstain from yawning in salah, reading the quran or doing dhikr.
Hadith – Bukhari 4:509, Narrated Abu Huraira:
The Prophet (peace be upon him) said, “Yawning is from Satan and if anyone of you yawns, he should check his yawning as much as possible, for if anyone of you (during the act of yawning) should say: ‘Ha’, Satan will laugh at him.”
Hadith – Bukhari 8:242, 8:245, Narrated Abu Huraira
The Prophet (peace be upon him) said, “Allah likes sneezing and dislikes yawning, so if someone sneezes and then praises Allah, then it is obligatory on every Muslim who heard him, to say: May Allah be merciful to you (Yar-hamuka-l-lah). But as regards yawning, it is from Satan, so one must try one’s best to stop it, if one says ‘Ha’ when yawning, Satan will laugh at him.”
Hadith – Muslim, Narrated AbuSa’id al-Khudri
Allah’s Apostle (peace be upon him) said: When one of you yawns, he should try to restrain it with the help of his hand since it is the Satan that enters therein.
Hadith – Mishkat, Narrated AbuHurayrah , transmitted by Tirmidhi and Ibn Majah.
Allah’s Messenger (peace be upon him) said, Yawning in prayer is an act of Shaytan, so when one of you yawns he should restrain it as much as possible. In another version it the word are: He should place his hand upon his mouth.