'Awhile’ is an adverb, but I’ve noticed it’s becoming common to confuse it with the article and noun (a while.) Hence:
I rested awhile. Fine.
It’s been awhile since I’ve seen you. Irksome.
I’m wondering whether commonality of usage in American English has reached a point where it’s become ‘officially’ acceptable, and I’d be interested to know what American schools teach on the matter.
And whether or not it matters is, I suppose, a matter of opinion.