Here's a babbling brook to help you relax and sleep or focus and study. I''m not sure why this brook is babbling, or why we never use the word brook without preceding it with babbling, but here is a relaxing, babbling brook. Or maybe it's a cheerful brook. Or maybe it should be an adjective-free brook. Why constrain this brook with adjectives? If you say brook too many times it loses it's meaning. Maybe I should call it a creek. What's the difference, anyway? English style concerns aside, this nature recording will help you get into a peaceful state of mind.