The verb in 'Vous étiez couchés.' is not reflexive but the verb coucher in the passive voice: 'Etre couché' = to be in bed.
You can 'coucher un bébé' (put a baby to bed) - active voice
It is the same for 'être allongé' (to be lying down),
'être debout' (to be up/ standing up),
'être assis' ( to be sat) etc....which all describe a state of being.
I believe it is the same in English ?
If you say 'vous vous êtes couchés' (you went to bed) you will use the reflexive 'se coucher' for the action of going to bed.
Hope this helps!
it should be vous vous étiez couchés.
Subject + reflexive pronoun + form of être + participle.
-- Chris (not a native speaker).
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