Why does beer make you sleepy?

You might notice that for a while if you are not a frequent drinker. But it would be a SERIOUS mistake to think of alchohol as a safe, effective sleep aid. It is not, and serious drinking will lead to serious sleep problems, possibly alchoholism, depression, problems with personal and social life, and job loss. Alchohol is one of the worst things you can turn to if you want and need good, healthy sleep.