Objects when ones nights are restless? (6)

I believe the answer is:

things

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

'objects when' is the definition.
'things' can be an answer for 'objects' (I've seen this before). I'm not certain of the 'when' bit.

'ones nights are restless?' is the wordplay.
'nights' anagrams to 'THINGS'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for things that I've seen before include "Items" , "Stuff" , "Objects" .)

I've seen this clue in the Evening Standard.

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