Light is painful when you’re suffering from a minimal headache, a hangover, and especially a migraine. Its brightness can trigger an even greater head pain, so don’t be afraid to turn things down a bit.
As mentioned at ZeroWays, migraines are most often caused by sensory stimuli—and lights are one of these. To achieve quick relief, shut out as much light as you can. Turn down the brightness by shutting off a few lights in the room you’re in, and make sure to close blinds or curtains. If you’re in need of even greater help, don’t be afraid to wear sunglasses, either indoors or out. The lenses can protect you from both natural and unnatural light.