Muhammad’s nurse wasn’t the only one to fear demonic possession on the part of Muhammad; the Prophet himself came to the exact same conclusion when he began receiving revelations from Gabriel. A full account of Muhammad’s first encounter with Gabriel is given in the Sirat Rasul Allah:
When it was the night on which God honored him with his mission and showed mercy on His servants thereby, Gabriel brought him the command of God. "He came to me," said the apostle of God, "while I was asleep, with a coverlet of brocade whereon was some writing, and said, ‘Read!’ I said, ‘What shall I read?’ He pressed me with it so tightly that I thought it was death; then he let me go and said, ‘Read!’ I said, ‘What shall I read?’ He pressed me with it again so that I thought it was death; then he let me go and said ‘Read!’ I said, ‘What shall I read?’ He pressed me with it the third time so that I thought it was death and said ‘Read!’ I said, ‘What then shall I read?’—and this I said only to deliver myself from him, lest he should do the same to me again. He said:
‘Read in the name of thy Lord who created,
Who created man of blood coagulated.
Read! Thy Lord is the most beneficent,
Who taught by the pen,
Taught that which they knew not unto men.’
So I read it, and he departed from me. And I awoke from my sleep, and it was as though these words were written on my heart."
So far so good, except for the violent manner in which Gabriel brought the message to Muhammad. But Muhammad’s interpretation of the event is quite revealing. His first impression of his encounter was that he had been possessed; as a result, Muhammad quickly became suicidal:
Now none of God’s creatures was more hateful to me than an (ecstatic) poet or a man possessed: I could not even look at them. I thought, Woe is me poet or possessed—Never shall Quraysh say this of me! I will go to the top of the mountain and throw myself down that I may kill myself and gain rest.
Muhammad tried to throw himself off a cliff, but he was stopped by Gabriel. He later became suicidal again when no additional revelations came.
Now tell me that this is not the behavior of a mad man, belonging in a nut house: "he was sitting on a chair in between the sky and the earth. I was so frightened by him that I fell on the ground and came to my family and said (to them), Cover me! (with a blanket), cover me!" (Sahih Al-Bukhari
, Number 3238.).