2006-11-26 07:20:49 · 5 answers · asked by Alex R 1 in Science & Mathematics ➔ Medicine
they don't, but it is generally easier to rest when brain does not have to process the visual input from eyes
2006-11-26 07:22:09 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Rapid Eye Movement. REM Sleep causes the eyes to twitch and this is a part of Melatonin formation in the PONS of the Brain. It is activated in a Dark Enviroment. This is why our eyes are closed and it is a reflex so we do not damage our eyes during sleep or or lower consciousness. Herbert West III west.herb@yahoo.com
2006-11-26 08:00:19 · answer #2 · answered by west.herb@yahoo.com 4 · 0⤊ 0⤋
They don't, but to sleep your brain has to produce melotonin, which is only produced when there is very little light in the room. It's also hard for the brain to make melotonin if it has to process images from the eyes at the same time.
2006-11-26 07:24:46 · answer #3 · answered by Maelys 2 · 0⤊ 0⤋
To keep them moist and protect the eyeballs. If you slept and yours eyes stayed open the air would dry them and bits from your bedding would get into them as there would be no protection and you would end up with eye infections.
2006-11-26 07:25:56 · answer #4 · answered by mistickle17 5 · 1⤊ 0⤋
You don't have to sleep with your eyes closed, but your MOIST eyeballs prefer it.
2006-11-27 18:27:18 · answer #5 · answered by Anonymous · 0⤊ 0⤋