be in a world of (one's) own

be in a world of (one's) own

To be consumed by one's thoughts, imagination, etc., to such a degree that one is unaware of or insensitive to one's surroundings and/or the outside world in general. When she starts writing, Helen is in a world of her own, and it's very difficult to get her attention.
See also: of, own, world
Farlex Dictionary of Idioms.

be, live, etc. in a world of your ˈown

seem not to be aware of things happening around you; be a person who has ideas that other people think are strange: I’m not surprised he didn’t know about it — he lives in a world of his own, that boy.
See also: of, own, world
Farlex Partner Idioms Dictionary
See also:
  • be, live, etc. in a world of your own
  • at the back of (one's) mind
  • at the back of your mind
  • at (one's) doorstep
  • at doorstep
  • be written all over (one's) face
  • be written all over somebody's face
  • be written all over your face
  • a change of scenery
  • a change of scene