From 4.30 to about 6.30 my 8 week old sleeps very lightly. She wakes up crying but by the time I go get her bottle and bring it to her she's asleep again. She does this every 20 minutes from 4.30 to 6.30am. Then at around 6.30 she wakes up properly. I'm torn between waking her at 430 and feeding her or just let her get on with it? It means my last two hours of sleep are non existent!