system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do people sleep better with background noise (like white noise or a fan)?
gpt
The brain craves sensory input to process, so when it''s completely quiet your brain starts straining to find information to process - either through your imagination or through the smallest little sounds it can pick up. White noise allows the brain to focus on something without actually generating much stimulation, thereby allowing you to get to sleep.