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How do blind people distinguish day and night?

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As anyone knows who has traversed nine or ten time zones in an airplane and ended up with a bad case of jetlag knows, the body clock doesn't rely very much on light and dark. In fact, in modern times, we get very little biological signal of night and day from our eyes, due to artificial lighting. read more

We’re not stupid. We can tell by the shift in temperature, slowing of traffic, crickets, and even smell. The evening and night also make sounds louder sometimes. read more

But again, this isn’t really a major disadvantage for blind people. Here are the ways that blind people differentiate between night and day: Using touchable or audible clocks (large clocks for those who are partially sighted). Just like most people in today’s world, blind people check their watches a lot. read more

Most people’s internal clocks naturally run slightly longer than 24 hours. Among the sighted, the clock is reset each day by signals from light-sensing cells in the eyes. But those who are totally blind lack this master reset mechanism. In theory, a blind person with a cycle of 24.5 hours would feel ready for sleep 30 minutes later each day. read more

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