The best working sleeping pills?

I take 300mg seroquel, 1 maximum strength melatonin tablet and 3 Calms Forte (not the round ones, the bigger ones in the white bottle) every night, but still have trouble falling asleep. It takes me a few hours to fall asleep after going to bed every night. Are there any sleeping pills that would work better? (As far as the Calms Forte, I have to take the others)