...is that they will wake each other up in the middle of the night. Claire had been sleeping 10-12 hours straight through the night since she was about 9 months old. And as you can imagine, all that changed when a screaming newborn came into the picture. And while this issue wasn't quite as bad during the second month of Aerin's life, when she regularly slept 7-8 hours straight through the night, it has recently become more serious as Aerin seems to have hit her 4-month sleep regression a few weeks early — waking up practically every hour during the night for the past week. Aerin has been sleeping in our room — in her bassinet, the swing, or on our bed — since...