Prepared the bed for sleeping in – didn’t like it (6,4)

I believe the answer is:

turned down

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'prepared' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Maybe you can see an association between them that I can't see?

I don't understand the rest of the clue.

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I've seen this clue in the Evening Standard.

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