illusion (noun): -an instance of a wrong or misinterpreted perception of a sensory experience.
-something that deceives by producing a false or misleading impression of reality.
-the state or condition of being deceived; misapprehension. an instance of being deceived.
-Psychology. a perception, as of visual stimuli (optical illusion), that represents what is perceived in a way different from the way it is in reality.
-Obsolete. the act of deceiving; deception; delusion.
Maybe...loss of consciousness, fainting, blackout...