Posted by Dr. Science on 11/19/2012 in
Question |
What causes the “sleep” I sometimes find in my eyes upon awakening?
———- from John C Lienhart of Portland, OR
If you wear contact lenses, it’s simply the dissolved plastic being drawn by osmotic pressure towards your cheeks. If not, then it’s usually discarded brain cells, especially the heavier brain cells from the medulla. Dead or dying cortical cells, with their frothy nature, float upward and find release as dandruff. If, for some reason, you don’t get your usual amount of sleep for a few days, when you do catch up you’ll find the amount of sleep in your eyes to be much greater. This is an example of the second law of Thermodynamics in action. Your brain cells are keenly aware of these laws, even if they’re dead.