Have you had the experience of camping  and you hear a strange noise?  Your imagination goes wild and you may really not want to know what your hearing.  The wind howls, the branches creak and the leaves are rustling!  You wake up your loved one to check it out and what you hear is,  go back to sleep...".It's nothing honey"!  I guess all you can do is pull those covers up a little tighter and wait for the morning!