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.
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Source: A Dictionary of American Idioms