I was wondering if it is ok to have a beer to help me sleep?

Well, I have a hard time sleeping, and always have. I don’t however know if there is something wrong with me. I survive on less than 3 hrs. a night. So today, I was at the store, and I bought a beer, and I don’t really drink, and when I do drink, it makes me very sleepy. Is it ok to do every once in a while? Or if you have any other suggestions, that might help, I would appreciate it.