Why do we yawn at Dihkr?

Question: In The Name Of Allah The Merciful, The Most Merciful.
May Allah send his peace and blessings upon Muhammad and the Family of Muhammad Imams and Mahdis.

Peace be upon you Ô Qa’im Ale Muhammad (Qa’im of the Family of Muhammad), my question is: why man when he does Tasbih (Praise) or Adhkaar (The contemplation/remembrance of Allah) or Istighfar (forgiveness) and especially forgiveness, he starts yawning and having tears in his eyes, or also when we hear your Dhikr (remembrance of Allah) we have tears in our eyes, or when we are humble?

Sender: Ahlam-Australia.

Answer: In the Name of Allah, the Abundantly Merciful, the Intensely Merciful,
Praise be to Allah, Lord of the worlds. May the Peace and Prayers of Allah be upon Muhammad and the progeny of Muhammad, the Imams and the Mahdis.

May Allah help you, for yawning, it is from darkness which is in man or Shaytan and evil which is on the page of his existence. When the darkness is besieged by light, the demons of mankind and jinn resort, through the darkness which is on the page of existence of man, to make the man fail from mentioning and remembering Allah, and this is by influencing him and his body by yawning and laziness and other human traits that make man resort to rest and leave the remembrance of Allah, and to get rid of them you should insist on remembering Allah (Dhikr) and not leaving the light and the contemplation on Allah until the demons despair, may Allah put them to shame, and you have in this thing a reward, because it is fighting demons and the Jund (soldiers) of Iblis may Allah put them to shame.

And may Allah send his Peace, Mercy and Blessings upon you.

Ahmed Alhasan
The middle of Shaâban/ 1431 H.