If unconscious, please treat (6)

I believe the answer is:

asleep

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

'if unconscious' is the definition.
I can't tell whether this defines the answer.

'please treat' is the wordplay.
'treat' indicates an anagram.
'please' is an anagram of 'ASLEEP'.

Can you help me to learn more?

(Other definitions for asleep that I've seen before include "Inattentive; numbed" , "Like kippers" , "Knitting up the ravelled sleeve of care" , "In slumber" , "Please be at rest (6)." .)

I've seen this clue in The Irish Times.

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