When we sneeze, the eyes always close unconsciously? It is a very interesting question. On the one hand, the production of sneezing needs a lot of force to eject from the gas, so our muscle will shrink. Considering the eyes and facial muscle are dominated by facial nerve, therefore we will automatically close the eyes. On the other hand, when you sneeze, the nervous system should be highly concentrated to complete a series of reflection. You may have such experience, you may try to close your eyes to reduce the interference outside. However, if someone bother you when you want to sneeze, maybe it probably do not come out.