Hoping someone out there has a bit of advice. Our 9-month old son has been a great sleeper his whole life (yes, I know we're very lucky). But suddenly he seems to be waking in the middle of the night and standing up in his crib and crying. If we go into the room and lay him back down, he usually goes right back to sleep. However, we're now trying to let him soothe himself and go back to sleep, but that ususally just leads to him to cry and scream and really wake himself up. Any thoughts on the best approach to help him soothe himself so he lays back down (himself) and goes back to sleep on his own without us having to come to help him every time? Thanks!