Hi, my name is H. and I have a very active 22 month old. I learned that as they become more active, moving, crawling, using all their new muscles they will have cranky nights. My dr also confirmed that. my son also became the same way while teething, they wouldn't bother him during the day but at night they would. i found that when i knew he was teething or noticed the bulging gums...i would give him the infant advil. it works 8 hours and not 4 like tynol (which i tried and quickly learned he was awaking up right when it was wearing off!) Or you can try the baby nighttime orgel (if he wakes up and that soothes the issue then you know) my son never slept with us but what really worked was routine. Owen knew what was next. bath, milk, teeth, reading, pray, and at that age I played baby einstein classic music. worked like a charm! does he have a bear? they say when your trying to get them to sleep in there own crib to do a few things, allow them to cry....which i did plenty of times...10-15 mins then go in...the key is not to talk to them (it's hard) check on them, then leave the room. Once you get them out of the crib and talk to them they'll want it everytime. Even in the middle of the night, owen would wake up at times fuss for about 10 mins sometimes longer but would go back to sleep...they as babies have to learn that on their own. It's not always good long turn to comfort them all the time but to let them know your their and in the room! Well, i'm not an expert...learned some things the hard way others through a great book called "what to expect when expecting" and "what to expect when the first year" hope i was helpful...good luck and enjoy that baby!!