F.R.
Good sleep is key to good health. I really hope you find some answers through our wonderful moms.
Exercise early in the day. Eat right. You're old enough to know what that means even if you don't practice it. This next one is hard... you're going to have to re-train your brain to not try and be supermom. Live in the moment. Don't worry yourself over all the little things that "need" to be done. Get a journal or pad of paper and write down the little to-do lists and thoughts that you seem to go over and over. Once it's written, you can actually look at it and not have to mentally keep checking on it.
Anything that stimulates your brain should be avoided for 15-20 minutes before bedtime. For most people, that's television. For some, books can be just as bad. That's for those that have an active imagination.
Most people's racing thoughts are worries. One mantra that helps me focus is "this too shall pass", whether it be a good moment or a bad one, it will pass. So if it's good, I need to take it all in and if it's bad, I know that I can hold on long enough to get through it. The one thing that never changes is knowing that eventually, everything changes.
The melatonin the other lady mentioned works fabulous. There are sleep teas you can buy. Just be careful not to overload them with sugar.
The otc sleep meds always make me groggy and irritable the next day, but with a brand called melosleep(online) I always woke up feeling great. Those breathe right nose strips help get more oxygen during sleep too. Love them.
Good luck!