We converted LO's crib to a toddler bed last weekend, and she occasionally falls out of bed in the middle of the night. (The rail covers only half of the opening.) I'm not concerned about her getting hurt because the bed is low to the ground, bedroom is carpeted, and I leave pillows next to the bed. However, it wakes her up and she's upset when it happens. I have put a rolled up towel under the fitted sheet to help keep her in, but it's still happening. Is this something that they just figure out over time? Did anyone else's LO have this problem? How long did it take before they stopped falling out of bed?