2007-02-22 08:41:08 · 3 answers · asked by Ear 3 in Health ➔ Other - Health
To protect them from drying. When we are awake we wink and by this we lubricate the eyes. when we are asleep we do not wink so we must close the eyes. Another reason is to protect them from any outside factor that can affect them without us noticing, like dust or sand.
2007-02-22 08:48:22 · answer #1 · answered by Balsam 6 · 1⤊ 0⤋
For a dictionary answer about sleep...
quote
" Sleep (slÄp) pronunciation
n.
A natural periodic state of rest for the mind and body, in which the eyes usually* close and consciousness is completely or partially lost, so that there is a decrease in bodily movement and responsiveness to external stimuli. During sleep the brain in humans and other mammals undergoes a characteristic cycle of brain-wave activity that includes intervals of dreaming." end quote
* note that it says usually. I think that it (closing of the eyes) is to reduce stimulus for the sleepers mind that he can enter sleeping state more easily.
And of course when you are really tired your eyes close by themselves so it would be hard for you to sleep with them open. And that would probably indicate some kind of a medical condition.
2007-02-22 17:05:59 · answer #2 · answered by Ville M 2 · 1⤊ 0⤋
Because it blocks out the light. And your eyes are closed while you are sleeping.
2007-02-22 16:48:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋