Crossword Genius

Pay attention and lose some sleep (3,2)

Ross

I believe the answer is:

sit up

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'pay attention' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for sit up that I've seen before include "form of exercise" , "postpone retirement" , "may aid fitness" , "Go to bed late" , "Abdominal exercise" .)

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