I went to visit my parents for the week and brought along our Baby Bjorn travel crib for the baby. She usually sleeps in a hammock sort of bed at home (literally, it hangs and gently swings when she moves). LO sleeps like a dream in it! Well, first night in the travel crib and as I'm middle of the night pumping, she wakes up. She never does this at home. I found her kinda sideways in the crib so clearly she moved. I don't know if that's what woke her? Is there anything I can do to safely keep her in one position so she doesn't wake up like this? Can I make some sort of "nest" or something? Also the mattress is tied down so I tucked a muslin blanket over it so LO isn't sleeping on the plasticy surface directly. So I don't have a sheet that can hold anything down.