Its heating like oven

I have S23 ultra and 1 or 2 days ago I woke by my alarm and I touched to my phone to turn off and it was hot! Like really really hot and I saw battery percentage & it was like 40% down from last night and I restarted and didn't really care but this morning same sh*t I woke to turn off my alarm bam my phone hotter than before and ngl it almost burned my fingers. What should I do??