Huh interesting. Searched out of curiosity, and I found 1 article saying you should close it as it will lower the temp throughout the night to allow for a more peaceful sleep and also for fire safety. Then right below was a link to another article stating you should leave it open as it will lower the temp via circulation. Fun, don’t think I’ve seen such mixed results.
Kind of a different scenario but reminds me of when a co-worker took sick days and almost immediately updated their profile picture of them being out-of-state. Left us baffled.