dd 5.5 months will not go to sleep at night. I've been trying to settle her since 7 but she wakes up when she is put down. She usually starts 2 hour stretches by midnight but not tonight. I have a 3 year old so can't catch up in the day or get an early night. Dh has tried rocking her, I am already co sleeping but it's the same each time, she wakes up ten mins or so after she's been put down. Really fed up.