in (one's) own (little) world

in (one's) own (little) world

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. It's no use trying to talk to Helen about something like this—she's always in her own little world.
See also: own, world
Farlex Dictionary of Idioms.

in one's own world

Also, in one's own little world; in a world of one's own. In deep thought or concentration. For example, Luanne was really in her own world at the meeting this morning, or Like many mathematicians, Bill lives in his own little world, or Bob's in a world of his own when he's listening to music. [Late 1500s]
See also: own, world
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • be in a world of (one's) own
  • 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