Malise Ruthven says of Muhammad receiving revelation:
We are told that he became covered with sweat, was seized with a violent shuddering, and lay unconscious for hours as though in a drunken stupor. At other times, the revelations were accompanied by ocular visions of angles who spoke to him.
This comes straight from the hadith pretty much. Some people have concluded that Muhammad was demon-possessed or epileptic based on these interesting sentences.
It does sound like it. Just as Socrates had his daimon.