My 4.5 month old has been waking every 1.5-2 hrs since 3.5 months. The past few days, he's been waking up every #*$(@#$&@ hour and taking 10 minutes to get settled back down. I can just about set my watch to it, every 46-49 minutes, he's up screaming. All. Night. From the time we put him down at 7pm till he is up for the day at 630. What gives!? His naps are exactly the same time also, 4x a day. Did anyone have it this bad overnight and did you have to sleep train or anything to make it improve, or did they just grow out of it?