This is the whole paragraph:
It cannon be a measure word, since 麻木 is an adjective, right?
Also, the 一 yi means A/AN or ALL/WHOLE in this context?
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片 has a meaning of "layered", and 一片 means "one layer of", in which, the layer of the substance has the sense that it covers/spreads out a wide area over something, such as "一片汪洋" - a wide (spread) ocean, "一片黑暗" - a wide (spread) darkness, and "一片白雪覆蓋着大地" - the ground is covered by a layer of white snow.
一片麻木 means a wide (spread) numbness. In which, 麻木 is a noun.
一片：all, completely, a scene of ....
(I've been) driving almost three hours now,
outside the car window (everything) is still dark and gloomy,
the girl sitting next to me is sleeping,
(her) forehead resting on the pillow at her shoulder
(her) right shoulder was already completely numb. (How do you know that if she's asleep??)
The sky was a brilliant blue.
After the election all was euphoria.