I have a rock sleeper similar to the one above, I was wondering if any one else has one? And if so is this the only place you let your newborn sleep? My daughter has a play yard and will stay in there but for short amounts of time an hour or so to sleep...however in the sleep rocker she got a good 2 hours of sleep. I think she prefers the sleep rocker better however my mother doesn't think it's a good idea to have her in the sleep rocker as she is "balled" up in it compared to the play yard where she has plenty of room.  Any thoughts on this?