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I’ll let it sleep. I did the same to my previous Mac, an iMac 2019, that I had for 3 years. Never had an issue with it.
 
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Not switching any electrical device off at night that isn't essential is irresponsible and wasteful in todays world!

While a solitary computer sipping power at night is personally very minor, collectively if all computer users globally share the same mindset it's a different story.

Just switch it off!
 
When I had my 2018 Intel mini I would just let it go to sleep by the default settings. I manually don't turn off any of my modern computers. They have power settings for a reason, and it automatically takes care of that.
 
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My M1 and 2012 Minis have both pretty much been on every day since I bought them new.
Same setup and I just let them sleep as well. Looks like a few of us hung on to the 2012 version. I’m planning on phasing it out but will keep it for dual boot or who knows, but once I get another M# mini the the 2012 gets turned off at night.
 
My 2014 is my file server so it’s on 24/7/365. No noticeable impact on my power bill since I bought it years ago. Night hours are when electricity is cheap anyways, so NBD.
 
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