Iv woke up with a sore red itchy belly button?

Yeast or staph. If you have a piercing, this could be a bacterial infection like staph. Even without a piercing, yeast infections also start in that area because it is warm and moist. Clean it carefully with a q tip and some peroxide for a couple of days, and try putting some lotrimin (clotrimazole) anti-yeast cream in the area. If the redness spreads, you get fever or you have increased pain, see your doctor right away.