My brother has sleeping problems, he talked to the doctor about it and his doctor gave him Melatonin. It helps but it doesn't work for everyone. It doesn't always work for him and his friend had the same problem and it didn't work for him either. Talk to your doctor he'll find something to make you fall asleep
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As for me, I hate the feeling. Sometimes I just go to bed and cant sleep at all. I'm just there, looking at nothing, rolling around every once in a while, adjuting my head and stuff. Lately I'm pretty tired after studying so much so I don't have too much trouble sleeping but I'm sure it'll come again after the exam period :P.