[scentedmeat]

I get that all the time too: Someone slams a door when I'm laying down, and it's like a flash going off in my face.

[ihoz]

That's Exploding Head Syndrome (https://en.wikipedia.org/wiki/Exploding_head_syndrome)

[stephentmcm]

Err, no it's not: Individuals with exploding head syndrome hear or experience loud imagined noises as they are falling asleep or waking up.

I experience GP's comment as well and it's from real sounds.