As my friends and I walked out of a restaurant together after lunch, all of us closed one eye and had the other eye almost fully open due to the change of brightness going from the somewhat dark ...

you may wonder if it’s actually possible to sleep with one eye open and one closed. In fact, there are a variety of medical conditions that may make it impossible to close your eyes when you sleep.

Have you ever been watching TV or reading a book and all of a sudden had blurry vision in one eye? Maybe you closed one eye and the picture looked fuzzy or the words on the page became harder to read.