DD (8 months) sleeps really well (sorry those less fortunate; if it's any consolation DS was a total nightmare and still wakes in the night frequently and usually gets up before 6 and he's 4!). However, in the past two weeks she has started singing in her sleep from about 3am. There's no way I can sleep through it, ear plugs make no difference and it's clear even on the lowest monitor setting. I'm knackered. Anyone else experience this? I'm hoping it is just a phase. It may have coincided with her sleeping on her tummy but if I roll her over she rolls straight back again.