When you first wake up from a really deep sleep and you aren't sure where you are or what is going on around you, this is an example of a time when you are in a daze.
The news left us all in a daze.
When you shock someone by telling them amazing news, this is an example of a time when you daze him.
He was in a daze.
Origin of daze
- Middle English dasen of Scandinavian origin Old Norse dasask to become weary
From American Heritage Dictionary of the English Language, 5th Edition