Hello J.,
I recently joined Le Leche League and learned that babies shouldn't always wean themselves, and that it is much healthier to breastfeed for at least one year. Some children may act out (like your little one biting) because they feel uncomfortable on the breast. Your son might need to nurse in a more comfortable environment. You mentioned that he nurses well before bed - is that because you nurse him in a different place? Maybe he feels most comfortable in that location. If you are nursing him in the same chair all day and night, then maybe you just need a new spot.
Do you feel nervous, hurried, or stressed when feeding? Sometimes your nerves will affect how your baby eats. I found an article online that suggests taking a bath with your baby, and then nurse skin-to-skin, so it's warm and comfortable for both of you.
I have the book "The Womanly Art of Breastfeeding" and it calls your situation a nursing strike: a baby under 1 year of age refuses to nurse. "A baby who is really ready to wean will usually be well over a year old, will be eating lots of solid food and drinking liquids from a cup, and will gradually loose interest in one nursing at a time." A baby who is just on a nursing strike will "show signs of being obviously unhappy about the whole situation. He wants you to figure out what's wrong..." Some things to consider: teething, outside interuptions/distractions, a recent change in your nursing pattern, too many bottles, being left for long periods with a sitter, etc. "Sometimes a nursing strike occurs after baby bites mother a time or two, and your understandable reaction has upset him. He bites, you jump or let out a startled cry. Baby is frightened, cries, and won't resume nursing for fear of another jolt or yell."
The book suggest nursing him on a normal routine or when he's really sleepy or already asleep. Some children will be the opposite and will nurse while the mother walks about. Either way, spend a few days putting all of your attention on him (or as much as you can). "Lots of cuddling, stroking, and skin-to-skin contact may help. Relaxing together in a warm bath may help...time just with you away from the hubbub of the rest of the family."
BTW, I am also a college professor. I teach near you at the DeVry University in Elk Grove. =)
Good luck!