The following tend to make people prone to palpitations feel them more acutely: alcohol, caffeine, nicotine, lack of sleep, anxiety, and certain medications. I always found that caffeine and lack of sleep particularly had an effect on me. Because alcohol is a depressant, it might make your heart beat slower, and like I said it might make you more aware of your palpitations. But again - I doubt a drink or two would have much an effect!