Sleeping with a fan on in a closed room

Growing up, I was always told to never sleep with a fan on indoors/in a room because you will die. Anyone else heard this before? Where did this originate from? I remember seeing this advice even on tv in Korea in the 90s. After becoming an adult, I realized that it was totally ok to do this but even til this day my mom says don’t do it. Please help me solve this mystery.

submitted by /u/Better-Vacation2121
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