why does a drunk man staggers(answer scientifically)?

Question

people doing science please help!

Answer 1

Because alcohol slows down the central nervous system, which controls motor coordination. His perception may also be affected.

Answer 2

You know when those people had an overdose of alcohol and stuff and there vision is so blurry you cant see where they are walking? well it affects their senisory motor stage and the vision part of their brain making their eye vision hard to see and the fact that they are being toxicated. Basically I guess its brain damage *sighs*