Crossword Genius

Was possibly begging to go to bed? (3,2)

Ross

I believe the answer is:

sat up

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

'bed?' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

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

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