Do not leave your Switch 2 in sleep mode and put it in a bag or whatever carrying thing you put it in. It is possible it could overheat.

I left my Switch 2 in a backpack designed for carrying a Switch in a pouch on the back in the inside of the backpack. I left it in the backpack on sleep mode with no game running give or take 15-30 minutes. I had the backpack in a car with air conditioning for 15 minutes. I was going to my hunting cabin to get rid of weeds on the property. Got out of the car with the windows down left my backpack in the car. It was under 90 degrees outside since it was evening it was a bit humid. I got it out a few minutes after arriving at my place it was warm to touch the fan was running. I turned it off immediately due to freaking out thinking it was going to overheat. It was a bit concerning with it being a bit warm like that with the fan running. It didn't overheat. I know you're not supposed to put a running laptop in a carrying bag because it could overheat I just never thought this could possibly happen to a Switch 2. I just wanted to warn everyone.