This happened to me when I was a kid. I'm sure I was awake and lying on my back, when I felt my feet and legs lifting out of my body. I felt very peaceful, but then I got scared thinking I was dying and it stopped. It never happened again, and I never forgot about it. I heard that young kids (before they know to be frightened) leave their bodies and kind of hover around. This sounds weird, but I have memories of hanging out in the corner near the ceiling and looking down at myself sleeping. Maybe they were just dreams, though.
I think kids are much more in touch with the spiritual world, since they came from there so recently. I guess some kids hear voices, but they aren't psychotic, it's just spirits talking but we can't hear them. My son (around age 4) used to cover his ears a lot, and he seemed distraught at times. After gently asking him questions, he admitted hearing people whispering in his ears. He told me a man and a lady, but he couldn't make out what they were saying. He admitted it was very upsetting to him. So, I was freaked out thinking he had mental problems, and I started researching on line. I was shocked to find this is a common occurrence in many kids! I didn't feel so bad then. Anyway, it said to pick a child's favorite toy and tell them this toy hears the noises, too. Then I got his dinosaur that makes a roaring sound and told him whenever he hears the noise hold up the dino to your favorite toy and make it growl in the ears to chase off the noise. I also told him he could say, "Go away noises, I don't like you!" He actually did these things off and on for a few days, and then it stopped. No more noises. Strange, but true.