Do you give it at night only? When baby seems bothered - whether it's day or night?

And do you have a preference between acetaminophen and ibuprofen?

My son woke up crying 3 times between 5-6 am this morning, which is really unusual for him. I chalked it up to more wonky sleep from practice crawling, but he just chewed on my finger and I can feel a sharp, little tooth poking through.

This might explain some of his fussier than usual behavior and his poor sleep this morning, but he doesn't seem to be bothered right now. So I dunno. Maybe I'll give him some tylenol before bed? Maybe wait to give it if he wakes overnight.