I want to go back to bed.

     I will, because I am tired, and I can use some more sleep.
     I just want to see if bed is a good key word.

     The word 'bed' brings up a lot of content.  As humans, we spend a third of our lives in bed, and not all of it goes to sleeping.

     I am tired now, and I would rather lay asleep in bed, than writing about it.