My CAH daughter was always a good sleeper. I didn't nurse her and she was sleeping through the night before 3 months old. I now have a 4 month old that was sleeping through the night since 1 week old until this week. I believe she is teething. I have recently started her on cereal, but that hasn't made much difference. My 9 year old still gets up during the night, she was the worst, always wants her mommy. Unfortunately when they know you will come running, they love to take advantage. Try to take a nap during the day. If you are working, take one on your lunch break. That's how I survived. Good luck.