Our son is 2 years 3 months. He has been sleeping through the night for several months and in his own room for almost 2 months since his baby brother was born. All has been fine until the last week... he will cry before he falls asleep and what's worse is he's woken up crying around 3am the past 2 mornings. Now this afternoon and evening he has been crying and clinging to me like never before. I'm worried he's having nightmares, but he doesn't have the words to tell me why he's crying. It's breaking my heart and the lack of sleep on top of having a newborn is getting to us all. Does anyone have experience with this?