I really don't think one glass of wine would make that much of a difference.
I do, from time to time, take a drink (But mostly cus my family glares at me when I refuse one at family gatherings...I think they feel as if tho I am being anti-social). At any rate, the most that has happened (and this is usually after more than one drink) is that my state would switch from depressive to manic...and last a bit longer than usual. If I would put my head down after a few drinks I would be out till the middle of the next day...
But, I don't think there is anything for you to be worried about in terms of a glass of wine over dinner