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Didn't in fact go to bed as put out (3,2)

Ross

I believe the answer is:

sat up

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'didn't in fact go to bed' is the definition.
I can't tell whether this defines the answer.

'as put out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'as'+'put'='asput'
'asput' is an anagram of 'SAT UP'.

Can you help me to learn more?

(Another definition for sat up that I've seen is " Suddenly became alert".)

I've seen this clue in The Globe and Mail.
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