Looking for some help and advice please. Since the Christmas break, DD (2.5) has started waking up at anywhere between 1am - 3am and staying awake for hours. She was a terrible sleeper until about a year ago, when she started sleeping through maybe 5 nights in 7, and although she would wake once during the other nights she could be resettled easily. Now she's awake for hours every night. We'll stay in her room and she'll lie in her cot quietly (after having a drink or a cuddle) but she won't let me leave until she's asleep - she screams the house down when I leave and as I also have a 4 year old this just wakes everyone up. DH and I taking it in turns to deal with this but as we're getting 3-4 hours sleep every other night it's not sustainable and causing issues with work etc. Any advice gratefully received!