Are any of your babies going through the 4 month sleep regression? I can't figure out what else could possibly be going on with my daughter. She had been sleeping SO well at night, and now, at 15 weeks, she's waking up at 2 and will NOT go back to sleep. My husband and I have to take turns staying up with her. She's either screaming bloody murder or wanting to play. She's napping fine through the day and going to bed at a reasonable time. I need to know we will survive this sleep regression! I'm exhausted :(