Eyes Open During Sleep

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Last month I travelled to Takoradi, the Oil city, to attend a workshop. I shared a room with a colleague at the workshop centre during the 2 weeks stay. I noticed that my colleague didn't close his eyes when he slept. Several times. It looked scary to me. When I asked him why he didn't close his eyes while sleeping, he looked surprised; he didn't even know that his eyes remain open when he slept. Is it a medical condition he should take care of? Or it's normal with some people?