1. get up
   Intransitive
   Meaning: get out of bed
   Example: I got up early today to study for my exam.

   When I was a child I used to sleep walk.  I would get up in the middle of the night and roam around the house until my parents heard me and told me to go back to bed.  Unlike the movies, sleepwalkers do not walk with their hands extended in front of them.  In the morning I would have no recollection of anything. Once I even sleep walked in a hotel!  Have you ever sleep walked?

2. Meaning: stand
         Example: Everyone got up when the judge entered the courtroom.