fugue

noun

1.
dissociative disorder in which a person forgets who they are and leaves home to create a new life; during the fugue there is no memory of the former life; after recovering there is no memory for events during the dissociative state
2.
a dreamlike state of altered consciousness that may last for hours or days
Derived from:
fugal
3.
a musical form consisting of a theme repeated a fifth above or a fourth below its first statement