I agree that it sounds like little Lou is growing! :) As long as nothing else changes in his routine (as has been our experience) he should return to his normal sleep pattern after the growth spurt (or teething, illness, whatever the case may be). We've also found - like Holly mentioned - the more restful sleep they get, the better they sleep.
Teething in our house has been much like Holly described - a non-event. Mine were both drool fountains from about 3 months until 10 or so, and both were very orally fixated, chewing on their own hands, my hands, clothing, burp cloths. Usually, I'd happen to take a random peek at their gums and discover some new teeth poking through. I know some babies have a much more difficult time with teething, but ours just seemed to sprout them overnight.
These babies always keep us guessing ;).