Can zolpidem when consumed after a lot of alcohol cause aggressive abnormal behavior and amnesia?

It can cause DEATH. That mix is dangerous - when you say a lot of alcohol - it is very dangerous. Aggressive behavior and amnesia are seriously bad, but it might have caused death - perhaps to the foolish user and others. If it's you, be careful! if a friend, warn them to be careful. This is not a mix to fool with.