Why does alcohol (* beer *) leave me wide awake, unable to sleep?

Yes, alcohol can cause sleeplessness. Often alcohol can help with a person falling asleep but will make their sleep not as deep or abnormal or something so that they wake up after just a few hours. I can't remember all the technical stuff about it but I know that's what science says. Although I don't know how all that applies to someone with ADHD. Just like how coffee seems to help you sleep, which is the opposite of how it works for most people. That's called a paradoxical reaction in scientific circles. Maybe alcohol works differently on you, I don't know. All I know is that for most people alcohol makes it harder for them to get a good night's sleep.