Fading sunburn??

So I got a really bad sunburn a day ago on my left side, chest, neck, and back from work. It was extremely painful and red just a few hours after it happened. I put a cold cloth on my shoulder, applied lotion because I don’t have any aloe, and went to bed.

I wake up this morning eating to feel the heat of my burn. I do, I look over and my burn is nearly gone. It went from the most red, awful sunburn I’d had to a slightly red tint.

I am really confused because I’ve had my lighter burns do that, but never a heavy one. Is it normal? Or what happened? I’m just so confused lol