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I was, callously, very glad that Vera had been up all Monday night
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Hasibul Alam Here up means stay?

"up" does not mean "stay", but "had been up all night" means roughly the same as "had stayed up all night", i.e. had been awake and out of bed.

Comments  

Vera was awake all night, not in bed.

 GPY's reply was promoted to an answer.