It's nighttime here in the US, so here's a good question for you to think about until you fall asleep. Do you sleep with a fan on, and if so, why?
Personally, I like the cool air. Due to my body being unique, I get a little hot under the covers.[spoiler] ( ͡° ͜ʖ ͡°) [/spoiler]
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I use one because my room doesn't have air conditioning and I need the background noise or I go insane.