Toddlers jumping into your bed at 2 a.m.? Need to sleep train a 4-year-old? Or change a sensitive kid's wake-up time? In our third and final episode as part of our Kids and Sleep series, Dr. Shelby Harris, Dr. Allison Shale, and Dr. Andrea Roth answer questions from Sleepopolis readers about the most difficult sleep situations happening in houses across the world.