it is really one of the most powerful chemical messengers that lets your body know when it s time to sleep. reporter: melatonin is naturally produced by your brain. it s the hormone that helps your body rest. the manufactured version can provide the body with a higher dosage helping stimulate faster sleep in some people. but because it is not fda approved some doctors expressed concern just because it is natural doesn t mean it is safe. there are essentially no long-term studies looking at possible side effects down the road. reporter: experts say in some cases over-the-counter melatonin can have side effects like headaches, dizziness, and daytime drowsiness. banks says her boys haven t had those reactions and for her family getting a good night s rest is worth the risk. juju chang, abc news, new york. that is going to bring us to this morning s facebook question. we want to know how do you help your kids when they have trouble sleeping?
study, both showing there was a significant increase in the risk of cancer for people that snore. and have sleep apnea. shepard: people who are now freaking out, because their partners or spouse have been mad at them for years because they snore all night, now they have to worry about cancer. guest: talk to your doctor and figure out what you can do do make the proper diagnosis from this study what they found is that those individuals with the lowest oxygen level, below 90 percent, they are the ones that had the five times increase in the risk of developing cancer. so the first thing to do is find out if you are to that group and there are simple studies to do. one study can be done at home that tests how much oxygen you have in your blood overnight. another study can be done at a sleep disorder center. but this are a couple of things people need to think about. there is a lot of people do not know they have sleep apnea. if you have daytime drowsiness,