Are there any common themes in the dreams so many Muslims have that prompt them to come to Jesus? I understand that a good number of believers, who were once Muslim, became Christians after having a dream where Jesus appears to them and tells them to follow Him.

Examples are recorded in books like I Dared to Call Him Father and others.

Are there any common themes in these dreams?  Does Jesus Himself always appear?

Also, is this common for people in any other religion like Hinduism, Taoism, or anything like that?
I have only heard of this happening en masse in the Muslim world.  The testimonies I have heard from missionaries to Turkey and Iran are these people are seeing Jesus appear to them.  

One other notable example I've heard of this happening recently (1996) to a non-Muslim is Joshua Blahyi, formerly known as General Butt Naked in Liberia.  He tells of a man and a woman appearing to him, and the man spoke in his old dialect.  He says the man was Jesus.  I don't know who the woman was.

You can see his story in a piece by the Vice Guide to Travel[possibly NSFW].