I'm looking for the title of a book about a ship that has colonized several systems, and is now traveling from planet to planet, monitoring their progress.
The ship is AI/sentient. And much of the narrative is the from the ship.
One planet has the people turning into trees. Another has people who think they should only sleep 3 hours a day.
I know that's kind of vague but it was about 20 years ago when I read this.