It is common in the Bible for people to "rise up," and it would be easy to pass over the phrase as simply describing a physical action. But in fact it represents an elevation in spiritual state, moving to a more internal frame of mind closer to the Lord. Often it has to do with understanding a new or important idea; we "rise up" to a state of greater perception and enlightenment. Obviously context is crucial to the exact meaning of the phrase in a given passage -- it matters greatly who it is that is rising up, and why.

In Genesis 28:12, this signifies foresight – for prophetic dreams were predictions of things to come. (Arcana Coelestia 3698)

A dream, as in Genesis 20:3, signifies something being somewhat obscure.

(Odkazy: Arcana Coelestia 2514; Exodus 3, 20)