For the last month or so dd (7 1/2 months) has been waking between 1 and 4 times in the night screaming. There doesn't appear to be anything wrong with her as she goes straight back to sleep as soon as I put her dummy back in her mouth. She has slept through the night since about 5 weeks. Does anyone have any ideas why she has started doing this? I'm starting to really struggle at work because I'm so tired and broken sleep gives me killer headaches.