I Wake Up At 4 Am Sneezing And Having To

I wake up at 4 am sneezing and having to blow my nose and then can't get back to sleep because of a stuffy blocked up feeling. Once I get out of bed I continue sneezing or feeling like I'm on the brink of a sneeze. I have to blow my nose a lot as it feels really blocked. Clear mucus is produced. I've had it for a month and Its very annoying. What can I do ?