All I know from experience, is that before wising up about it, in the past I would try to use alcohol to help me sleep during dysphoric mania, and instead of helping me sleep, it would just make me feel much worse, and I would end up being up all night anyway, just going through the whole process of being drunk, sobering up and being hungover, all while still awake and feeling miserable. So I don't know from experience if alcohol can cause mania, but I do know from my own experiences that its depressant effect is rendered useless when I'm wound up.