I know what you mean. I get two or three non-consecutive hours of sleep a night. Most of it is because of racing thoughts and also because I hear voices whispering around me although I can't quite make out what they're saying. I thought it was the tv because my wife has it on all night while she sleeps. But, then, she got a wireless headset and I was still hearing the voices. So, my psych put me on a low dose anti-schizophrenia med and, on nights my mind won't shut off and keeps showing me horrible things, I take a Xanax to relax. Just the anti-schizo Med helps me sleep (sometimes too much). I was on a number of different sleep meds at different times both OTC and prescription. Nothing worked for me. Some actually made me more awake.
So, talk to your doc and see if there's an underlying issue that might be causing the sleep loss. Maybe you just need a med that has a different approach. Also limit your caffeine intake. As little as possible throughout the day and nothing but water after 4pm. And only use your bedroom for sleeping. No tv and, if you can't sleep, leave your bed and go somewhere and read something boring.