in the clouds

in the clouds  {adj. phr.}

Far from real life; in dreams; in fancy; in thought.

When Alice agreed to marry Jim, Jim went home in the clouds.

- Often used with "head", "mind", "thoughts".

Mary is looking out the window, not at the chalkboard; her head is in the clouds again.

A good teacher should have his head in the clouds sometimes, but his feet always on the ground.

Contrast:

COME BACK TO EARTH,

FEET ON THE GROUND.