No night vision? (8)

I believe the answer is:

daydream

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'no night vision?' is the definition.
'daydream' can be an answer for 'vision?' (daydream is a kind of vision). I'm not sure about the 'no night' bit.

'night vision?' is the wordplay.
'night' becomes 'day' (I can't explain this - if you can you should believe this answer much more).
'vision?' becomes 'dream' (dream is a kind of vision).
'day'+'dream'='DAYDREAM'

Can you help me to learn more?

(Other definitions for daydream that I've seen before include "Distracting thoughts" , "Diurnal reveries" , "An idle diurnal fantasy" , "(Indulge in) idle reverie" , "A pleasant diurnal fantasy" .)

I've seen this clue in The Guardian.

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