Sleep and sleeping disorders

Another thing I was wondering about was Alaska. I know that sounds funny but they have many months out of the year where it is always light even at night and times where it is dark even during the day. My question about that was if people in Alaska have more sleeping disorders due to the light and dark abnormality? I would think they do because their body can't tell if it is time to sleep or not.

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...ck that is referenced is "called the suprachiasmatic nucleus or SCN, [and] is actually a pair of pinhead-sized brain structures that together contain about 20,000 neurons. The SCN rests in a part of the brain called the hypothalamus, just above the point where the optic nerves cross. Light that ...