My Right Thumb Has Developed An Involuntary Twitch Which Is

My right thumb has developed an involuntary twitch which is waking me up during the night. It comes and goes, maybe once or twice a week. I am fit, healthy, drink a bit too much alcohol (3-4 glasses of red wine a day), 53kg, 5'5" height, eat fruit and veggies, don't enjoy coffee much (1 cup per day max), avoid Aspartame and don't drink fizzy drinks - prefer water (or wine!) Is this nerve damage or something that will go away if I change my habits?