The Default Mode Network (sometimes called simply the default network or the DMN) refers to an interconnected group of brain structures that are hypothesized to be part of a functional system. The DMN includes areas of the brain which researchers found to have higher activity when the mind was supposed to be at rest.  For example, when you are day dreaming, thinking about the future, replaying memories, etc. without a specific goal in mind.  Now, why would we care about this? The DMN is found to have increased activity in certain mood and pain disorders.  That being said, let's look at our 3 reasons why you should know about the DMN.