Naomi - Yes CJ still sleeps on her back (she hasn't yet rolled from back to front, although can seem to twist the whole top half of her body, just doesn't flip the legs), and sleeps just like she die with the brace on, legs splayed and arms up - she doesn't move around hardly at all. Not sure if the not moving much is a result of the brace or her personality but it does make life easier when I hear about babies hitting heads, getting arms and legs stuck in bars etc.