E.,
If it is hormonally caused, I don't even think a doctor that uses cream hormones can help as you may need the balance you have to keep lactating if you're breast feeding. You can get a hormone test to see if you like. My getting to sleep imiproved immensely following menapause) by using cream hormones. Dr. Connie Casad, gynecologist, Dallas Medical Center, is great to help determine that.
Much of the rest of this advice stems also on whether or not you're nursing. If nursing, check first with your gynecologist or pediatrician.
Melatonin supplements. You can try 1, 2, or 3 30 minutes before bedtime.
No doubt your maternal instincts have you ready to pounce up if you hear anything unusual coming from the baby's room. But if you're an experienced mom, that may not be a source.
Are you sensitive to caffeine like I am? I learned not to drink tea, coffee, most sodas after 4pm in the day.
Having your room very dark helps some people so that their own natural melatonin is released.
I play spa type music softly in the background when going to sleep to help drown out active thoughts.
Occasionally, I do use Lunesta. My doctor thinks that is far safer than Ambian in several ways. If you're not nursing, it is not supposed to be addictive but I suppose anyone could overuse it if they wanted to. BUT if you don't get 7 hours sleep, you feel pretty bad in the morning. Kind of like a mild hangover or like someone woke you up in the middle of the night when you were in your deepest sleep. Therefore, if you're the one that gets up with teh baby in the night, I wouldn't recommend it.
You can take over the counter sleep remedies which are antihistimines that make you drowsy. Benedryl is the strongest but I can get that too tired feeling for about 30 minutes until the coffee works. Not a great feeling. A better antihismine is Chlortimatrane. It comes in 4-6-8 hour pills. It doesn't make me feel so groggy the next morning. It's now harder to find but worth searching for.
Lastly, if you are supressing something that really bothers you (that perhaps your husband or anyone else said, did or didn't do, and you suppressed it and can't find a common ground, it makes it really hard to go back to sleep even if your mind isn't on it. Your subconscious can be frustrated enough to affect you subconsciously.
That's my bag of tricks that have worked for me when needed. Good luck.