I have noticed lately that MJ doesnt move in her sleep at all.

The only thing that she will do is move her head from side to side and possibly kick her legs (but se does this usually when she wakes)

I have put her down on her side and on her belly at night in desperation to herlp her sleep better, she seems to prefer to sleep on us, so figured that belly sleeping may be better with her. (we have a breathing/movement monitor)
She does seem to sleep for longer stretches on her belly, but it does worry me that she has never rolled over or attemped to move in her sleep. I could understand it when she was younger.
Could this be why she is waking now?
Anyone else baby's not move, Should she be doing this by almost 8mths???