Help - my baby won't feed?

Teething. No idea why, but it is worse at night, and holding his mouth in that position might be uncomfortable. You are doing a great thing by continuing to feed. Don't worry that you need to change anything about feeding him (you might just bring on a whole new set of problems) but try some teething drops (Gentle Naturals is our favorite, or Hylands tablets.) Good luck, and keep nurturing your babe so well!