My lack of sleep

Something I have been focusing on lately is how much sleep I actually get. Since Andrew has been on holidays I sleep in as much as possible. It made me realise that what I am getting is not enough!
Every night Miss A wakes at 12:30 and 3.
Maybe 2 nights a week it will only be once she gets up and at least one night a week she gets up 3 or 4 times. This means my brain doesn't even start to shut off until after 12:30am.
If I got I bed at 10pm I lay there and think and think...if I did everything I was thinking of I would be superwoman. I think of things to do around the house, the kids, I get on Facebook. The list goes on. In the end she either comes in or I fall asleep around 1am. Then I'm usually woken about 2 hours later. After that it takes me about 30min to go back to sleep only to wake again about 7am.
So when I sat down and worked it out to be about 2 hours and then 3.5 hours broken sleep in one night it's not good.
The act of getting to sleep is the worst now. I remember when I had severe insomnia while pregnant with Lily, and had as little as 2 hours a night. I can feel that same pattern starting. My best sleep is between 3 and 9am. As the kids are up at 7 and sadly Andrew isn't going to be on holiday forever it's not realistic, so I need to reset my sleeping patterns. I'm going to look at some natural alternatives with valerian and something to turn my mind off.
Considering its 12:30am now and Miss A has already been in twice tonight is a good example.
So anyone got any good tips on getting to sleep....?
If only I could sleep as well as Miss L!