Problem getting to sleep
When you think deeply it most of our sleep problems are created by ourselves;That is by our modern western lifestyles...
When we watch Television late at night which constantly stimulates us to buy, to get annoyed, or to get upset, and then leaves us hanging with the events then our brain is telling us we need to solve the problem. Whether is about politics or crime, or the myriad of issues sensationalised by current affairs programmes. This is especially the case for impressionable children who can really become highly aroused and agitated with the stuff that put on the box. So it's logical if you go to bed with highly charged emotions your not going to sleep. I don't watch TV late at night anymore. Even though it presented my parents an easy baby-sitting device.
Then you have the issue of fizzy drinks. pop,coke,cordial with sugar that kids enjoy. Trouble is it gives them instant energy which they don't need when you want them to settle down and go to sleep.
Remove these two activities and replace them with reading before bed is my advice. There could be other causes. But these two might help both in sleep and other ways....
If you suffer from Sleep Apnea of other sleep disorders you need to get medical help. i know often we do not know we suffer from a particular condition until it gets properly and correctly diagnosed. If your sleep condition is chronic it is strongly advised to get a referral from your doctor to a Sleep Disorders Clinic who will perform tests on your body as you attempt to sleep at one of their clinincs.