What determines whether or not you have a sleep disorder?

Are sleep disorders things like sleep apnea and insomnia? I mean i am having trouble sleeping at night. Sometimes i dont sleep until 3 am or 6 am and then i only get like 3 hours sleep if that. Other nights i sleep for 11 hours or more. I know its all about setting your body clock but i have so much trouble actually GETTING to sleep in the first place. Its like i am sooo tired but just cant sleep no matter what. Its starting to get really frustrating..

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