If you *always* drink when you are alone it'll become quite a dangerous habit. Some people think drinking will combat your boredom but it's only coz it stops you having the mental capacity to do anything useful. Next time you're bored on your own look for other things that need to be done, there is always something. If you do something constructive like cleaning or arranging things that would further your possible career like volunteer work, you'll also experience a sense of acheivement instead of feeling horrible and hungover afterwards.