Wine makes me sleepy

I have really bad insomnia. It's so bad that I've taken strong sleeping pills to help, and even those don't make me tired or keep me asleep. However, I notice that when I drink one glass of wine before bed, it makes me EXTREMELY tired. Like I can not stay up for a movie, when usually o have no problem. Does wine make anyone else tired? Why does it do that! Lol. I'm not complaining, just curious 😂