Sentence:  For <WSD>many</WSD> nights afterward , the idea of her having been so close to me in that imagined bed would return and fill me with obscure and painful desires , would cause me to lie awake in shame , tossing with irresolution , longing to fall into a deep sleep . 
Meaning of the word marked with <WSD> tags:  a quantifier that can be used with count nouns and is often preceded by `as' or `too' or `so' or `that'; amounting to a large but indefinite number