Crossword Genius

Sleepy part of commuter land? (9,4)

Ross

I believe the answer is:

dormitory town

I'm a little stuck... Click here to teach me more about this clue!

'commuter land?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'sleepy part of' is the wordplay.
I cannot really see how this works, but
'part' could be 'mi' (mi is a kind of part) and 'mi' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for dormitory town that I've seen before include "Place where commuters live" , "suburb?" .)

I've seen this clue in The Times.
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