Was it just a sneeze when he woke up that forced a booger out, or is it a lot of sneezing with a runny nose (especially if green or yellow), bubbles from nose, watery eyes? If it was just a random sneeze and you don't notice any more sneezing or snot, it was probably just a sneeze and nothing to worry about. If it's the second one and there's a runny nose and lots of sneezing/coughing, you should get to the vet in the next day or two because it could be an upper respiratory infection that if left untreated could develop into pneumonia. The vet can put your hedgie on an antibiotic that should help clear it up before it develops into anything worse.
my hedgie has kind of damp (if i can say so) nose. it s not wet or dripping. he huffs and puffs quite much, sometimes sneezes once or twice. this time i woke him up, he had a piece of shavings on his nose. i removed it, then the sneeze came followed by a snot. snot was yellowish. snotty sneeze happened only once. his eyes are ok, beady bright and angry, 'cause i woke him up. he eats well, runs a lot, and generally looks quite ok.
i shall watch him even more closely this evning. if snotting countinues, he is going to see a vet.