These phosphenes, as they're called, are like tiny, neon lights that dance behind your eyelids, and they're not just random - they can be influenced by things like stress, fatigue, and even caffeine (so, maybe lay off the coffee before bedtime, huh?). It's like your brain is trying to put on a fireworks display, and you're the lucky audience of one. And the best part? You don't even need to pay for tickets!
But what causes these phantom lights, you ask? Well, it's not aliens trying to communicate with you (unfortunately, or fortunately, depending on how you feel about alien invasions), but rather your brain's visual cortex going rogue. It's like your brain is saying, "Hey, you know what? I'm bored with darkness. Let's put on a show!" And just like that, the light extravaganza begins.