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I have trouble getting into a pattern because it breaks so easily. For a few weeks, I got into a nice midnight-8am sleep pattern but it quickly broke because I tend to work best between midnight and 3am. For some reason my brain just feels "fresh" during this time frame. Perhaps it was because my body was not fully into the new pattern. >>
There are a few disorders that can influence your circadian rhythm (your internal clock that tells you when to be 'awake' and when to be 'sleepy'); Seasonal Affective Disorder, Delayed Sleep Phase Syndrome, and Advanced Sleep Phase Syndrome.
The symptoms of Delayed Sleep Phase Syndrome include trouble falling asleep with a tendency to be awake during the night (insomnia) and trouble getting up in the morning, which is similar to your problem.
In addition to the other good suggestions, I recommend a blast of sunlight or a therapeutic light for 15 - 30 minutes immediately after you get up in the morning. That is the most common therapy for sleep phase disturbances. Get up at 8:00am or whenever you prefer, then spend the next 15 - 30 minutes in direct sunlight (doesn't cost a thing) or a therapy grade light such as those sold by
Apollo Light.
Do this in the morning immediately after you get up for at least seven consecutive days. It can help "reset" your internal clock so that it knows it should be tired at midnight instead of buzzing with energy. People who have easily disturbed circadian rhythms may need to use light therapy on and off like this 3 to 4 times a year, as their internal clock starts to get out of whack again.
If you've tried all these suggestions in earnest and still don't find relief, ask your family doctor for a referral to a sleep disorder specialist.