Hey there,
@loosse up. You will find lots of company on this site; many of us struggle with sleep, me included.
My first question is: Did you have sleep problems before tinnitus? Or did they come immediately following tinnitus? I had been struggling with insomnia for years prior to tinnitus, which then really kicked it into high gear. My insomnia probably is related to neurological problems I developed following a stroke and cerebral bleed in 1999. I have accepted the fact that I probably never will be able to sleep again without some kind of assistance, be it a natural supplement or a medication.
Sleep problems seem to come in two major forms: those related to your brain in some way, and those related to your respiratory function (ie, the sleep apnea variety). I went through the whole sleep study thing and found I had only mild apnea. The c-pap machine did nothing but make me miserable. Still, a sleep study might not be a bad idea to rule out that line of sleep problems.
It wasn't until I came down with tinnitus that I learned what a large role anxiety plays in insomnia. Often, doctors will couple a sleep med with a very low dose of an anti-anxiety drug, like valium or xanax. This helped me.
And there are many sleep medications to chose from. If you are getting only four hours sleep on a very large dose, its probably time to try another med. Problem with most sleep drugs is your body can build up a tolerance. Ones that have worked well for people here include: Remeron, Lunesta, trazadone. I primarily take Rozerem, which is pharmaceutical grade melatonin and therefore much less likely to cause dependence. But there are times when the Rozerem just stops working so I have to go back to Lunesta for a bit, then return to Rozerem. Important, though: Everyone is different. What works for me may not work for you. These drugs tinker with your brain chemistry so use them with care, and under the supervision of a doc who knows what he/she is doing.
Natural supplements that are effective include valerian root, melatonin, trypothan and camomille tea. Be careful with melatonin, though; it's a hormone and pretty powerful stuff. You really shouldn't take more than 3 mg a night. They sell it in 10 mg tablets, among other doses, why I don't know.
Assume you already have tried all the proper sleep hygiene stuff: no TV in your bedroom, no heavy meals or caffeine before bedtime, careful with the alcohol before sleep, sleeping and waking at the same time every night, keep your room dark and cold, use your bedroom only for sleep, etc. Plenty of info on this on the web.
White noise also is helpful. I personally use a pillow that you can plug into a iPhone or white noise device.
http://www.soundpillow.com. But there are many apps or white noise devices that can help with sleep. Even just running a fan can work.
As
@jimH said, lots of talk here at TT about sleep. Here is one thread but there is many. Just go the search field and look around.
https://www.tinnitustalk.com/threads/tinnitus-first-night-without-sleep.1951/#post-61379
Good luck and sweet dreams soon, I hope.