this happens here too - Noah gets very clingy and bad sleeping. i find after they come through (he has 4 now) he has a day or 2 where he catches up on sleep (YAY) and then is back to a bit worse than normal.. (i think he takes a while to settle back and to be honest we have had constant teething now for over a month)
my fam day care mum recommended i massage his gums with vegemite (eeww i know) and this does help him.