1)
Why does it say that he rose in the morning?
1.
Radak: His heart did not lie (rest) at night. In the morning, Gad came to tell him what Hashem told Gad at night.
2)
Why is he called Chozeh David?
1.
Malbim: His prophecies were for David; through him, Hashem spoke to David, even though this is his only prophecy that was written.
