Can I sleep with my window open with a betta?

During the summers, it can get down to about 7 degrees celsius but most nights it's about 13 degrees outside. My bedroom gets really hot even though it's in the basement so I was wondering if my betta would be ok if I made it a little cooler. His tank isn't heated as it's naturally hot enough for him. show more During the summers, it can get down to about 7 degrees celsius but most nights it's about 13 degrees outside. My bedroom gets really hot even though it's in the basement so I was wondering if my betta would be ok if I made it a little cooler. His tank isn't heated as it's naturally hot enough for him.
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