There were even some of Muhammad’s contemporaries who thought that Satan, or an evil spirit, had taken control of Muhammad. Some examples of which include:
Narrated Jundub bin Sufyan:
Once Allah's Apostle became sick and could not offer his night prayer (Tahajjud) for two or three nights. Then a lady (the wife of Abu Lahab) came and said, "O Muhammad! I think that your Satan has forsaken you, for I have not seen him with you for two or three nights!" On that Allah revealed: 'By the fore-noon, and by the night when it darkens, your Lord (O Muhammad) has neither forsaken you, nor hated you.' (93.1-3) (Sahih Al-Bukhari, Volume 6, Book 60, Number 475)
One of the Meccan Chiefs told Muhammad that:
… ‘I will make some suggestions, and perhaps you will be able to accept one of them.’ The apostle agreed, and he went on, ‘If what you want is money, we will gather for you of our property so that you may be the richest of us; if want honour, we will make you our chief so that no one can decide anything apart from you; if you want sovereignty, we will make you king, and if this ghost which comes to you, which you see, is such that you cannot get rid of him, we will find a physician for you, and exhaust our means in getting you cured, for OFTEN a familiar spirit gets possession of a man until he can be cured of it,’ or words to that effect…
And:
… No Arab had ever treated his tribe as Muhammad had treated them, and they repeated the charges which have been mentioned on several occasions, If it was money he wanted, they would make him the richest of them all; if it was honour, he should be their prince; if it was sovereignty, they would make him king; if it was a spirit which had got possession of him (they used to call the familiar spirit of the jinn ra’iy), they would exhaust their means in finding medicine to cure him. The Apostle replied he had no such intention… (Alfred Guillaume, The Life of Muhammad [Oxford University Press, Karachi, tenth impression 1995], pp. 132, 133-134; underlined emphasis ours)
Interestingly, there were people such as the cousin of Muhammad’s first wife Khadijah, himself a Christian monk, who knew that Satan could imitate Gabriel:
"Waraqa was dumbfounded at this, and said, ‘If Gabriel has actually placed his feet upon the earth, he has done so for the best of people thereupon. And he never came down for anyone except a prophet. For he is the companion of all the prophets and messengers, the one whom God sends down to them. I believe what you tell me of him. Send for 'Abd Allah's son, so that I may question him, hear what he says and talk to him. I am afraid it may be someone other than Gabriel, for certain devils imitate him and by so doing can mislead and corrupt some men. This can result in a man becoming confused and even crazy whereas before he had been of sound mind.’" (Ibn Kathir, The Life of the Prophet Muhammad (Al-Sira al-Nabawiyya), Volume I, translated by professor Trevor Le Gassick, reviewed by Dr. Ahmed Fareed [Garnet Publishing Limited, 8 Southern Court, south Street Reading RG1 4QS, UK; The Center for Muslim Contribution to Civilization, 1998], pp. 296-297; bold italic emphasis ours)
According to the above data the signs of possession, sorcery, and satanic activity are:
Choking, gasping, spasmodic movements, delirium, and whisperings.
Spitting and blowing (knots).
Eloquent speech.
Bad and evil dreams.
The use of bells.
Now let us turn to the Islamic literature to see if Muhammad manifested any of these features and symptoms.
More at the link:
Evidence for Muhammad Being Deceived