Overheating

I've had my Pixel 8 pro for about 6 months now and after the latest Update, it started running very hot for no reason. I went to sleep and it was under my pillow. Upon waking it was as hot as a furnace. I don't have anything installed on it that could warrant heavy power consumption. I don't game on my phone, it was idle but it overheated. Does anyone know why this could be happening?