The average man has an erection every hour or so whilst asleep.

The average man has an erection every hour or so whilst asleep

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Optophobia is the fear of opening one’s eyes

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Your eyes are about 1 inch across and weigh about 0.25 ounce

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Your eyes start to develop two weeks after you are conceived

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Only 1/6 of the human eyeball is exposed

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Sleep is so important to the brain that scientists believe you can only