have (your) head in the clouds

to not know what is really happening around you because you are paying too much attention to your own ideas.

He's an academic. They've all got their heads in the clouds.

• when the going gets rough
• when the going gets tough
• when the spirit moves
• when the spirit moves you
• when was a mere twinkle in father's eye
• when was a mere twinkle in their father's eye
• when was a twinkle in father's eye
• when was a twinkle in their father's eye
• when your ship comes in
• where is coming from
• where someone is coming from
• Where's the beef?
• Where there's a will there's a way!
• Where there's muck, there's brass.
• where there's smoke, there's fire
• whet appetite
• whether by accident or design
• whether or not
• whet someone's appetite
• which way the wind is blowing
• while away
• while away something
• while back is turned
• while someone's back is turned
• While the cat's away .