To relax, some people prefer a drink to medication. Alcohol does indeed have an anxiolytic and sedative effect on many people, but it also has a number of disadvantages: working efficiently with a mind clouded by alcohol is a feat, and far from increasing performance, alcohol can actually reduce your ability to memorize.
It's also worth noting that, for about one in two people, alcohol disrupts sleep. Beware of that little evening drink to help you fall asleep: you risk waking up at 2 a.m., very nervous, and almost unable to go back to sleep. If you're feeling too anxious, too nervous, or if you have trouble falling asleep , other solutions ( or non) could prove much better.