View Full Version : Why do I see a light flash when startled in my sleep?
04-23-2009, 12:05 AM
Sometimes when I'm almost asleep and wake up by a sudden loud noise I see a light flash. The more startling sound whiter and brighter the light is. Sometimes I see different colors with different noises and it only happens when I'm trying to fall asleep.
04-23-2009, 12:50 AM
Cecil speaks on a related issue; Why do I see sparks when I cough with my eyes closed? (http://www.straightdope.com/columns/read/86/why-do-i-see-sparks-when-i-cough-with-my-eyes-closed)
My guess is the same principle is involved; you are startled, that produces a surge in blood pressure, that stimulates photoreceptor cells in the eyes.
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