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I have no background in science as I am a computer programmer, but I am trying to get information on phase response curves, human sleep and exposure to bright light as I am trying to get to grips with a possible diagnosis of delayed sleep phase disorder.

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The point marked phase delay is typically where someone would go to sleep and they would typically wake a couple hours after the peak marked phase advance. What is the physiological process that cause the move from delay to advance via the point marked singularity? In other words, why does light cause a delay initially but then cause an advance?

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