I had a terrible time with Seroquel. One time I passed out on the bathroom floor and banged my head quite badly. Since then, my psychiatrist did some research since I was not responding well to any medications -
sleep was a major issue for me too - and found a town in TX where lithium orotate was found in the drinking water and the residents had very low rates of depression/suicide. He prescribed this for me along with magnesium glycinate (both over-the-Amazon-counter) and after about 3 months (it takes that long to get into your system) I began sleeping much more easily. I take 5m of the lithium orotate and 400m of the magnesium glycinate just before bedtime, read for awhile and fall asleep. I hope you consider trying these and that they will help. Remember to take them regularly at night and be patient while your body builds up enough of a reservoir to make the difference you're hoping for.