Whenever I drink a beer, I get so sleepy that I can barely keep my eyes open. Is it the hops? It can't be the just alcohol - wine and vodka don't make me sleepy like beer.
That is, compared to an unhopped beer (rare nowadays), or an equivalent amount of alcohol. I see many sources online saying so, but with no links to actual studies, and I recall reading a while ago (studies found via Google Scholar, I believe) that the purported effects of phytoestrogens in hops were exaggerated, at least in the context of (sexual) potency and developing male breasts (to avoid the colloquial terms).