We are trying to get my DD to sleep without her being walked. So we have been just laying her down in her bed when she seems tired. Well at first she would lay there for a bit and play with her feet and roll around and chew on her blanket and then eventually cry which is when we picked her up. But we went and got this thing that plays music and puts moving waves on the ceiling and she seems to really like that. Tonight we tried it and she just laid there for almost 30 minutes before we walked her because she was just laying there, not sleeping or even seeming sleepy. My question is, how long should we let her lay there for??? I don't want to get her up too soon or her to feel lonely at all.