I told her I was asleep for most of it
What was on your mind when you told her about that?
That it should not be an issue.
A lot of people fall asleep during movies. It's not that big of a deal.
I wouldn't have minded the criticisms if that was true.
This sleepiness may just be a sign that you are not that into the movie. Since this is the case, maybe trying to a different sort of movie next time will allow you to keep your attention.