Hello.
I had really bad insomminia post ds, and stupidly never went to the doctor, but looking back I was a basket case.
It's good that you are tackling this,and not pretending everything is OK, like I did. I did get zopiclone at one point (although never told the doc about the PND because I thought they would take ds away if they knew how nuts I was-see I had become so bad I was totally irrational).
Anyway, I felt I couldn't take it, as I was a single parent, and was too anxious about being drugged.
So, I tried some other things, with advice from a hypnotist, which helped actually:
Firstly, make sure you are eating plenty of slow acting carbs. Lay off sugar, as this will often cause you to wake too often in the night, or too early in the morning.
When you are in bed make tiny circles on the sheets with your thumb.
Say to yourself that you have to keep doing this, no matter how tired you get.
It's amazing how focusing on one small physical movement can take the focus off whether you are sleeping or not. You will find that you are struggling to keep doing the tiny circles, and when you can't keep going, you will fall asleep.
Also, practice relaxation exercises in bed. Feel every part of your body become heavy and still, from your head, going down your whole body.
Mentally focus on each part of your body, and don't rush.
Often it is the tenseness of our limbs and muscles which keeps our bodies from relaxing fully into sleep.
Tell yourself that you don't have to sleep-the body being relaxed and your eyes being closed will produce the same hormones that you get from sleep, and help you to feel refreshed.
Take the pressure off, and just enjoy the feeling of being relaxed.
Sorry-flippin essay here, but I know how bad it can be, and I just wanted to share some of the things which helped me. I sleep pretty good now!