Crossword Genius

Unable to sleep because of an all-night feast (5)

Ross

I believe the answer is:

awake

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'unable to sleep' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for awake that I've seen before include "Conscious and (usually) open-eyed" , "Become active again" , "Unable to sleep" , "On the ball?" , "Rouse; vigilant" .)

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