Insomnia

So I'm thinking that I have insomnia I haven't gone to a doctor or anything, but I find myself up at all hours of the night. Not able to fall to sleep, my mind keeps working it just won't stop and I just keep thinking I'm so tired! So then I'm exhausted all day at work I get home and I'm so tired I just want to sleep but I think no just keep going until bed time then you'll be able to sleep. Then it gets to be 930 or 10 pm and I'm wide awake once again, usually until close to midnight or 1 am. If anyone has any suggestions of what I can do I'm all ears. I just want to sleep and feel rested again.