When I got home last night, I plugged my switch into my spare charger. Official Nintendo charger, mind you. Never had any problems with it, didn't worry about it, went to bed.
Just picked up my Switch and it was red hot. Thought it was weird, but didn't mind. And then I fired up Zelda, where it was night time in the game. I noticed the sky looked weird, and then it hit me.
It's not as noticeable as it is in person, but that's the fucking Switch main menu burned into my screen. FAST RMX and Snipperclips tiles, super visibly burned into the screen.
Somehow, despite my settings being set to go into sleep after 10 minutes of inactivity, my Switch stayed on with the screen at it's normal brightness for 24 hours. And it the screen got so hot that my tempered glass screen cover is starting to come off, too.
This is fucking infuriating. I have it completely turned off for the night and I'm going to hope it's not still there tomorrow. But I'm still extremely concerned why it didn't go into sleep mode from sitting on the main menu without any input at all for over 24 hours.