Re the comment in Baby Love, its if a baby is teething they will generally only wake in the first 3hrs because of any pain. Unless I go back and read the book re teething I'm pretty sure it says that yes 'teething doesn't cause any real pain' but also that there are no pin-point reactions which are recognised as pain due to the different reactions babies can have.
The reasoning behind this is the fact that when a baby/child/adult is asleep their blood pressure lowers and any pain they were in before they went to sleep reduces, even more so if pain relief medication is taken.
I used to get migraines and I would take pain killers and go to sleep and wake the next day fine. I know this doesn't work with everybody but it is actually true. I have spoken to quite a few different medical people (doctors, osteo, chiro, acupunturist) about it and even they said its right.
But on saying that some bubs still may be unsettled at night. I'm one of the lucky ones my DS is feral during the day when he has a tooth worrying him but once he's asleep I might hear him have a little grizzle/cry an hour or so later but that's all.
Frozen teething rings are great for bubs to chew on, I use Hylands Teething Tablets and find them so much better than gels and if you really think bub needs it Panadol/Nurofen before bed.
[Edited on 08/09/2008]