Blocked nose? I get a blocked nose from 9 30 pm till 9 am, any ideas why?

Well, if there was Vog where you live, it makes peoples sinuses go nuts. I live here in Hawaii, so I know. It really isn’t a comfortable situation. Another reason could be because of an allergy, or perhaps the area you are at is too dusty? Also, just in case you are wondering what is vog, vog is the volcanic ash in the air after a volcano erupts. ?

It's called Winter.