Yes, as general consensus is, once they do it, there is nothing you can do to stop it. They can get so active around their cot now, so just make sure their is nothing in it to smother up against.

I have one sleep talker and one sleep 'walker'. DD1 started sleep crying/talking about 10months. We thought she was crying but learnt she was actually still asleep, she now yabbers her head off. DD2 sleep 'walks' or as much as a baby can, from about 6 months she has done weird things in her sleep like smiles, waves, sits up has a dance, lays back down, has a chat, plays with her hair and now her new one, signs the word bath (which she learnt last week). To begin with it drove me nuts thinking 'this child just doesnt sleep, until I realised her eyes were shut and if you actually pick her arm up and drop it their isn't any muscle control.