Yes, if the Bible said it happened then it happened. However, I know that's not the answer you're looking for. I think back then the bride wore some type of facial covering on the wedding night. Second, there were no light switches so I'm sure it was pitch black. Third, I'm sure Laban instructed her to keep quiet. Fourth, men and women before marriage were not allowed to have much interaction so he may have not been very familiar with her mannerisms. And lastly, I'm sure the wedding feast involved a lot of drinking and I'll bet Laban made sure to hand Jacob a drink every time his hand was empty. Of course, I don't "know" any of this but this is my thoughts on how it could be possible.