At night when your sleeping a bunch of things such as sweat, oil, and tears leak into your eyes. The only reason you don't get anything when awake is because your eyelashes are your eyes "windshield wipers" its a just a sign that Mr. SandMan stopped by for a visit ;)
x_s_a_r_a_h_x answered Wednesday May 23 2007, 8:00 am: Its just from while you were asleep, as you don't blink when you're sleeping so the crusty gunk forms as your eyelids are unable to wipe the stuff that falls into your eyes away.
It can also happen really bad if you have hayfever. [ x_s_a_r_a_h_x's advice column | Ask x_s_a_r_a_h_x A Question ]
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