Why is the sky white at night?

so yesterday it was raining at like 11:30 PM and for some reason, the sky started to get whiter and whiter with a tint of dark purple, I thought this was the end of the world until I started to stare into it, and thought it was beautiful in a weird way, and kept on staring out my window till I slept, the next day I went ahead and bought some kerosene, filled up the kerosene heater and let it soak it a little, and I kept thinking of last night, even now while I suck on a melatonin pill to sleep I still think about it

Weird...