K.B.
I, too, suffer from insomnia. Melatonin is not good for women of child bearing years.... I used to take a supplemet called Tryptophan (which is found in Turkey, and why people get tired after a turkey dinner) Tryptophan is an essential amino acid, meaning that the body can't manufacture it. The body has to get tryptophan and other essential amino acids from food. Tryptophan helps the body produce the B-vitamin niacin, which, in turn, helps the body produce serotonin, a remarkable chemical that acts as a calming agent in the brain and plays a key role in sleep. They banned tryptophan supplements in the 90s... but I think they have one called l-tryptophan out now. I would not recommend the supplement.. but maybe a turkey sandwich before bed?!
Warm glass of milk? Stay away from any alcohol, the sugars can wake you up at night... as well as any caffeine.. (chocolate, ice tea, or other things you don't think about).
If you are up because your brain won't turn off, and you are obsessing about things; try writing it down on a pad before you go to bed, or even when you wake up in the night so you can go back to sleep and not have to worry about remembering something.
Make sure your room is dark. Pitch Black is best. Room Darkening shades, and no ambient light. If the clock is illuminated, that can be an issue. ALWAYS turn the clock away so you can't see it when you sleep. If you have insomnia, you are likely to keep looking at the clock, if that is not an option it may be easier to go back to sleep. Also no television in bed... or stimulation like that prior to sleep.
It is best to try and read a good book for about 1/2 hour before bed.
Good Luck, I feel your pain. Sometimes nothing seems to work, but that is usually when I just can't shut my brain off.