hi I never thought of illusion. I don't believe in it. Everyhting is "real," but in a way that does not imply that some things are illusion. Reality exists at different levels. Birth and death may be considered two sides of the came coin, but what really unties the knot of fear is realizing that the self has never come into existence, not being an incidence in time, it is no subject to complete termination. Your physical death may be death to you, to the degree to which you are attached to your situation in life, your memories and so on. In otherwords, there is a real reason to fear death for those who do so merely because most of what they consider themselves will die. Similarly, a non lucid dream self cannot comprehend that it exists outside of the dream and that it will contine after the dream- It cannot distinguish between the dream and what you know as reality when you wake up. The dream is not illusion, it is very real to the dream self, but actual reality has a relative superiority to dream reality.