Why a fire feels so calm
A fire has a soft, low roar with little pops and crackles on top. It's warm, unhurried and a little unpredictable, so it holds just enough attention to quiet a busy mind without keeping you up.
Fire, rain and a fan
Fire works well as a layer. Try it with rain for a rainy night in a cabin, or with a low fan underneath to fill in the quiet moments between crackles.