Personal Advice
Despite this professional opinion, most people’s solution to the issue is to plug in a fan. It cools them down, sure, but you also get the white noise effect from it, which can be just as useful for helping you nod off.

Personal Advice
Balance
A fan is going to keep air circulating around your room all night, keeping it cool and preventing it from getting musty. However, you still need to weigh up the pros and cons of leaving one on overnight.
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Balance